STYLE: standardize if/else statements and indents
If script fails, display error and ABORT execution
STYLE: Create functions to avoid having to write twice the same code and reduce writing functions size
ENH: Return exit code during execution of cmake script, and abort if error
ENH: Patch ANTS to prevent boost from compiling its failing librairies
Merge pull request #2 from adrienkaiser/master

BUG: fix Boost compilation error + abort execution if error