Update to new roboptim-core API.
Generalize test to prepare for sparse matrices support.
Add support for sparse matrices.
Add one test for the schittkowski test suite.
Fix gradient computation
Reorganize shared tests.
Add sparse matrices support.
Fix sparse matrix support.
Reserve sparse vector space when computing sparse gradients.
Various minor improvements on testsuite.
Add common.hh.
Fix problem71.
Add problem2.
Add problem 3.
Add probem 4.
Make test suite generic.
Make test suite generic.
Fix warnings.
Add fixture.hh.
Update to new roboptim-core macros.