Added support for AdhocFS API

Although the different adhocfs can be supported using LD_PRELOAD, a better approach will be to include user libraries for each fs.

• GekkoFS
• Expand
• Hercules

Actually, the implementation of GekkoFS is achievable using the fmt10 branch. For the other FS we need to :

1. Modify the different Findxxx.cmake
2. Add the corresponding .hpp
3. Modify the called functions to the good ones.