Refactoring

[Wikunia]

• [x] alldifferent folder for bipartite
• [ ] change all type of indices variables to idx instead of index or ind.
• [ ] Move functions out of ConstraintSolver.jl
  • [ ] low level interface (maybe can be removed or move to extra file)
  • [ ] pruning
  • [ ] bounds/objective
  • [ ] split backtracking function
• [ ] Rename TableLogger.jl to tablelogger.jl
• [ ] still_feasible change index,value argument position
• [ ] naming of equal.jl and eq_sum

[Wikunia]

See #178