WIP: Conflicts are fixed and LBFGSOptimizer is added to ITK

At this patch I made changes to several files to make the different
parts of BRAINSTools compatible with new version of BRAINSFitv4.

Also, several configuration issues are solved, and now BRIANSTools
is built succesfully based on the last version of ITK that includs
the LBFGSOptimizer.