Merge pull request #2 from b-schubert/fix/warmstart-fix

fixed the warm start stuff to always feasible solutions.
Testings
Merge branch 'develop' of https://github.com/b-schubert/bi-objective-solver into develop
Merge branch 'develop' of https://github.com/b-schubert/bi-objective-solver into develop
initialization changes

warm-start was something wrong... think it happend during the reset yesterday.

changed some logic and odering in the approximation scheme
fixed approximation bug
Merge pull request #5 from b-schubert/fix/approximation_point_comparison

Fix/approximation point comparison