Remove custom ILP solver adapter implementation if possible

[maxkratz]

The implementation of ilp/wrapper/IncrementalIlpSolver.java can potentially be removed due to the fact that emoflon has its own ILP solver interface (at least as I heard!).

[maxkratz]

The old eMoflon ILP solver interface should not be used for iflye. Instead, I suggest using the new project https://github.com/eMoflon/emoflon-ilp.