Update version history in preparation for 2.1.0

Change-Id: I3771d5d289bbb9982eeec2ae3701246dd25eaac1

docs/source/features.rst

diff --git a/docs/source/features.rst b/docs/source/features.rst
index 956eb00..dacb327 100644
--- a/docs/source/features.rst
+++ b/docs/source/features.rst
@@ -31,10 +31,10 @@
     allows the user to *shape* their residuals using a
     :class:`LossFunction` to reduce the influence of outliers.
 
-  - **Local Parameterization** In many cases, some parameters lie on a
-    manifold other than Euclidean space, e.g., rotation matrices. In
-    such cases, the user can specify the geometry of the local tangent
-    space by specifying a :class:`LocalParameterization` object.
+  - **Manifolds** In many cases, some parameters lie on a manifold
+    other than Euclidean space, e.g., rotation matrices. In such
+    cases, the user can specify the geometry of the local tangent
+    space by specifying a :class:`Manifold` object.
 
 * **Solver Choice** Depending on the size, sparsity structure, time &
   memory budgets, and solution quality requirements, different

docs/source/version_history.rst

diff --git a/docs/source/version_history.rst b/docs/source/version_history.rst
index 1329af6..112bc4c 100644
--- a/docs/source/version_history.rst
+++ b/docs/source/version_history.rst
@@ -1,9 +1,148 @@
+.. default-domain:: cpp
+
+.. highlight:: c++
+
+.. cpp:namespace:: ceres
+
+
 .. _chapter-version-history:
 
 ===============
 Version History
 ===============
 
+2.1.0
+=====
+
+New Features
+------------
+
+#. Support for CUDA based dense solvers - ``DENSE_QR``,
+   ``DENSE_NORMAL_CHOLESKY`` & ``DENSE_SCHUR`` (Joydeep Biswas, Sameer
+   Agarwal)
+
+#. :class:`Manifold` is the new
+   :class:`LocalParameterization`. Version 2.1 is the transition
+   release where users can use both :class:`LocalParameterization` as
+   well as :class:`Manifold` objects as they transition from the
+   former to the latter. :class:`LocalParameterization` will be
+   removed in version 2.2. There should be no numerical change to the
+   results as a result of this change. (Sameer Agarwal, Johannes Beck,
+   Sergiu Deitsch)
+
+#. A number of changes to ``Jet`` s (Sergiu Deitsch)
+
+   * Jet gained support for, ``copysign``, ``fma`` (fused
+     multiply-add), ``midpoint`` (C++20 and above), ``lerp`` (C++20
+     and above), 3-argument ``hypot`` (C++17 and above), ``log10``,
+     ``log1p``, ``exp1m``, ``norm`` (squared L^2 norm).
+
+   * Quiet floating-point comparison: ``isless``, ``isgreater``,
+     ``islessgreater``, ``islessequal``, ``isgreaterequal``,
+     ``isunordered``, ``signbit``, ``fdim``
+
+   * Categorization and comparison operations are applied exclusively
+     and consistently to the scalar part of a Jet now: ``isnan``,
+     ``isinf``, ``isnormal``, ``isfinite``, ``fpclassify`` (new),
+     ``fmin``, ``fmax``
+
+  * It is now possible to safely compare a ``Jet`` against a scalar
+    (or literal) without constructing a ``Jet`` first (even if it's
+    nested):
+
+    .. code-block:: c++
+
+       Jet<Jet<Jet<T, N>, M>, O> x;
+       if (x == 2) { } // equivalent to x.a.a.a == 2
+
+
+    This enables interaction with various arithmetic functions that
+    expect a scalar like instance, such as ``boost::math::pow<-N>``
+    for reciprocal computation.
+
+#. Add :class:`NumericDiffFirstOrderFunction` (Sameer Agarwal)
+
+
+Backward Incompatible API Changes
+---------------------------------
+
+#. :class:`LocalParameterization` is deprecated. It will be removed in
+   version 2.2. Use :class:`Manifold` instead.
+#. Classification functions like ``IsFinite`` are deprecated. Use the
+   ``c++11`` functions (``isfinite``, ``isnan`` etc) going
+   forward. However to maintain consistent behaviour with comparison
+   operators, these functions only inspect the scalar part of the
+   ``Jet``.
+
+Bug Fixes & Minor Changes
+-------------------------
+
+#. Modernize the code to be inline with ``c++14`` (Sergiu Deitsch, Sameer
+   Agarwal)
+#. Lots of fixes to make Ceres compile out of the box on Windows
+   (Sergiu Deitsch)
+#. Standardize path handling using ``GNUImstallDirs`` (Sergiu Deitsch)
+#. Add final specifier to classes to help the compiler with
+   devirtualization (Sameer Agarwal)
+#. LOTs of clean & modernization of the CMake build files (Sergiu
+   Deitsch & Alex Stewart)
+#. Simplification to the symbol export logic (Sergiu Deitsch)
+#. Add cmake option ``ENABLE_BITCODE`` for iOS builds (John Harrison)
+#. Add const accessor for functor wrapped by auto/numeric-diff objects
+   (Alex Stewart)
+#. Cleanup & refactor ``jet_test.cc``. (Sameer Agarwal)
+#. Fix docs of supported sparse backends for mixed precision solvers
+   (Alex Stewart)
+#. Fix C++20 compilation (Sergiu Deitsch)
+#. Add an example for ``BiCubicInterpolator`` (Dmitriy Korcchemkin)
+#. Add a section to the documentation on implicit and inverse function
+   theorems (Sameer Agarwal)
+#. Add a note about Trigg's correction (Sameer Agarwal)
+#. Fix the docs for ``Problem::RemoveResidualBlock`` &
+   ``Problem::RemoveParameterBlock`` (Sameer Agarwal)
+#. Fix an incorrect check in ``reorder_program.cc`` (William Gandler)
+#. Add ``function_tolerance`` based convergence testing to ``TinySolver``
+   (Sameer Agarwal).
+#. Fix a number of typos in ``rotation.h`` (@yiping)
+#. Fix a typo in ``interfacing_with_autodiff.rst`` (@tangobravo)
+#. Fix a matrix sizing bug in covariance_impl.cc (William Gandler)
+#. Fix a bug in ``system_test.cc`` (William Gandler)
+#. Fix the Jacobian computation in ``trust_region_minimizer_test.cc``
+   (William Gandler)
+#. Fix a bug in ``local_parameterization_test.cc`` (William Gandler)
+#. Add accessors to ``GradientProblem`` (Sameer Agarwal)
+#. Refactor ``small_blas_gemm_benchmark`` (Ahmed Taei)
+#. Refactor ``small_blas_test`` (Ahmed Taei)
+#. Fix dependency check for building documentation (Sumit Dey)
+#. Fix an errant double link in the docs (Timon Knigge)
+#. Fix a typo in the version history (Noah Snavely)
+#. Fix typo in LossFunctionWrapper sample code (Dmitriy Korchemkin)
+#. Add fmax/fmin overloads for scalars (Alex Karatarakis)
+#. Introduce benchmarks for ``Jet`` operations (Alexander Karatarakis)
+#. Fix typos in documentation and fix the documentation for
+   ``IterationSummary`` (Alexander Karatarakis)
+#. Do not check MaxNumThreadsAvailable if the thread number is set
+   to 1. (Fuhao Shi)
+#. Add a macro ``CERES_GET_FLAG``. (Sameer Agarwal)
+#. Reduce log spam in ``covariance_impl.cc`` (Daniel Henell)
+#. Fix FindTBB version detection with TBB >= 2021.1.1 (Alex Stewart)
+#. Fix Eigen3_VERSION (Florian Berchtold)
+#. Allow Unity Build (Tobias Schluter)
+#. Make miniglog's InitGoogleLogging argument const (Tobias Schluter)
+#. Use portable expression for constant 2/sqrt(pi) (Tobias Schluter)
+#. Fix a number of compile errors related (Austin Schuch)
+   *. ``format not a string literal``
+   *. ``-Wno-maybe-uninitialized error``
+   *. ``nonnull arg compared to NULL``
+   *. ``-Wno-format-nonliteral``
+   *. ``-Wmissing-field-initializers``
+   *. ``-Werror``
+#. Fix ``cc_binary`` includes so examples build as an external repo
+   (Austin Schuh)
+#. Fix an explicit double in TinySolver (Bogdan Burlacu)
+#. Fix unit quaternion rotation (Mykyta Kozlov)
+
+
 2.0.0
 =====