DVCSObservable.xml and GPD.xml

Update of partons.properties too. Necessary after creation of new
folders in partons-example.

Some modifications to the conf files, as in PARTONS
partons/core/partons#21 partons/core/partons#22 partons/core/partons#28

47d8c09bd3bc1e673536d782b88daec6434cb674

Reorganize scenarios

Update .cproject by adding NumA dependence 

(instead of PARTONS_release)

- Add missing build/ folder.
- Add .gitignore.
- Fix cmake Find modules.

In ALL (trunk):
- Improvements on the previous cmake commits.

In Elementary_utils (trunk):
- Add the installation routines in CMakeLists.
- Add doxyfile.

In NumA++ (trunk):
- Add the installation routines in CMakeLists.
- Add FindElementaryUtils.cmake module and adapt CMakeLists.

In NumA++_Tests (trunk):
- Add FindElementaryUtils.cmake & FindNumA++.cmake modules and adapt CMakeLists.

In PARTONS (trunk):
- Add the installation routines in CMakeLists.
- Add FindElementaryUtils.cmake & FindNumA++.cmake modules and adapt CMakeLists.

In PARTONS_exe, PARTONS_release, PARTONS_Tests, PARTONS_Fits (trunk):
- Add FindElementaryUtils.cmake, FindNumA++.cmake & FindPARTONS.cmake modules and adapt CMakeLists.

In PARTONS_release (trunk) :
- Move examples from main.cpp to examples.cpp
- Remove beam_energy configuration for process module in examples.

In PARTONS_release (trunk) :
- Add some examples in main.cpp.

In PARTONS_release (trunk) :
- Correct typo in scenario files.
- Move some stuff to PARTONS_Tests