Problem while initializing costs.

Ub was not properly updated.

Now update only 2 trees: the most divergent and a random one.
Use SoPlex instead of lp_solve (but still commented).
When finding DAC supports, now favors values that have been selected by other trees.

Skip assigned variables and deconnected constraints.
Read new constraints (from variable elimination).

Moved DD-MRF after VAC, added LP check, added sum-product, etc.

Compile, works, but does not communicate with the WCSP.

Fix the issue of inconsistency between flow and DP for Regular() due to deltaCost may be unchanged in project()

Nettoyage de blancs.

nettoyage d'espaces

Nettoyage d'espace en prime.

Ajour de la fonction Exp.

is now required for toulbar2 compilation

[bugs] incop is now available under windows and Linux version. Timer is not available under windows OS