Squashed 'cmake/Modules/' changes from 5478da4..4e98486

4e98486 fixing the definitions getter in a more robust way
efe5d02 bug fix about the scope for the use in the function package_use_system
732fe22 adding a simple function
9f4aa17 had to modify something in the cache variables: is it the way should have been done ?
7870cf3 Merge branch 'master' of gitolite-lsmssrv1:akantu
c6bf1c2 correction of compilation for examples
4a6f5ca correction of python wrapper
9f90244 corrections in the package sysem + python
bd5255e Change for the external projects variables
cc92ef8 bug fix
489d880 added the test for real
583f134 reactivated the test: need to add the listing of files for the packaging system
5387270 bug fix
76507b4 Rewrote the package system
f77efff static libraries troubles
250b34d IOHelper as external

git-subtree-dir: cmake/Modules
git-subtree-split: 4e984865c1a782ddf35c8596aadf4ed89484a285