Merge from V6_main (04/10/2012)
Merge from V6_main_20120808 08Aug12
Merge from BR_V5_DEV 16Feb09
Join modifications from BR_Dev_For_4_0 tag V4_1_1.
Join modifications from branch BR_DEBUG_3_2_0b1
Join modifications from branch OCC_development_for_3_2_0a2
Merge with OCC-V2_1_0_deb
DCQ : Merge with Ecole_Ete_a6.
yfr : Merge with v1.2
NRI : First integration.