Initial commit for ex6.
Initial commit for ex7.
Split linear_program.c. Put new_lp_from_file into read_lp.c. Start to refine lp API.
Define several getters/setters for lp.
Refine lp API.
Better name for variable assignment.
Use gray-codes.
Change API for finding solutions.
Merge https://github.com/mattmilten/appfs
Fix compilation errors.
Adapt tests to gray_code structure.
Test constraint_type parsing.
Check #solutions if reading file.
Merge pull request #61 from wuschel91/master

Code cleanup + gray codes (no cache). Improve test cases.