ENH: Update Superbuild system (passes only necessary variables in each External_* file)
ENH: Update compilation of Swig and Python
BUG: FFTW was not passing compilation flags to configure script
ENH: Python builds statically
ENH: Update tools revisions
ENH: Update extra configuration file names
Merge branch 'update-tools'

Conflicts:
	SuperBuild/External_DTI_Tract_Stat.cmake
Merge branch 'master' of github.com:fbudin69500/NAMICExternalProjects

Conflicts:
	SuperBuild.cmake
	SuperBuild/External_SlicerExecutionModel.cmake
	SuperBuild/External_VTK.cmake