Fix issue #17 (Create a script to patch Altera's Makefile).

I added a Python script which updates an Altera Makefile to add the few
declarations needed to compile the various CVRA projects.
Removed debug info.

I forgot to remove a debug print, which caused problems in the generated
Makefile.
Rewrote help messages.
Merge pull request #18 from antoinealb/issue-17-patch-makefile

Fix issue #17 (Create a script to patch Altera's Makefile).
Merge pull request #24 from antoinealb/master

Add some doc