Fix broken constant parameter blocks

This fixes the bug introduced in a previous commit,
and adds a test to check that constant parameter
blocks work as expected.

This also refactors the Solver/SolverImpl split so
that SolverImpl is no longer a friend of Problem;
instead, Solver is. This makes it possible to
verify the invariant on parameter block states in
the unit test, and is a more symmetric design
anyway.

Bug: 51
Change-Id: Id503f5b526cfb8bc24aae3aaad2e414b14063d78