[debug] ToulBar2::uai used only for file format reader and energy information output (same as ToulBar2::bayesian) BUT not for solution printing in MPE file (controled by ToulBar2::uaieval flag)

[option] new value ordering heuristic exploiting last solution found (solution-based phase saving). see option -solr

[option trws] new option for TRW-S in preprocessing ; kill several bugs about ToulBar2::costMultiplier and check multiplication overflow when loading the problem

[misc] reverted endSolve() to its initial signature + account for deltaUb in QPBO internally generated ub.

[bug] If an absolute gap is specified, only ub for true solutionsq/certificate can be shifted, niot initial Ubs.