Rationalize some of the variable names in Solver::Options.

lm_max_diagonal -> max_lm_diagonal
lm_min_diagonal -> min_lm_diagonal
linear_solver_max_num_iterations -> max_linear_solver_iterations
linear_solver_min_num_iterations -> min_linear_solver_iterations

This follows the pattern for the other parameters in Solver::Options
where, the max/min is the first word followed by the name of the
parameter.

Change-Id: I0893610fceb6b7983fdb458a65522ba7079596a7
diff --git a/internal/ceres/dogleg_strategy.cc b/internal/ceres/dogleg_strategy.cc
index 957f58f..c85c8e5 100644
--- a/internal/ceres/dogleg_strategy.cc
+++ b/internal/ceres/dogleg_strategy.cc
@@ -53,8 +53,8 @@
     : linear_solver_(options.linear_solver),
       radius_(options.initial_radius),
       max_radius_(options.max_radius),
-      min_diagonal_(options.lm_min_diagonal),
-      max_diagonal_(options.lm_max_diagonal),
+      min_diagonal_(options.min_lm_diagonal),
+      max_diagonal_(options.max_lm_diagonal),
       mu_(kMinMu),
       min_mu_(kMinMu),
       max_mu_(kMaxMu),