Implement version information

See merge request !2

The doxygen @brief is either added or given further details

18 doxygen

See merge request !1

- Add layout scheme to match PARTONS 
- Apply current style
- Update doxyfile
   - update titles
   - update mathjax script
   - make it similar to PARTONS doxyfile

- Generate tagfile to be used by NumA and PARTONS documentations.
- Some fixed to avoid conflicts with namespaces in documentation.

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 ElementaryUtils (trunk) :
- Add a clear() method in Formatter class.

In ElementaryUtils (trunk):
- Better implementation of the precision in Formatter and GenericType.

In ElementaryUtils (trunk):
- Change GenericType and Formatter precision to 16 instead of 17, to avoid messy numbers in formatting.

In NumA++ (trunk):
- Change some std::runtime_error to CustonException. A lot more to change...
- Time monitoring in LSMR.

In PARTONS:
- Inherit IncompleteGPDModule from GPDModule to be able to use GPDService. Lot of useless code commented.
- Some changes in Radon inversion modules...

In ElementaryUtils (trunk) :
- Move formatDate(...) from LoggerMessage class to StringUtils class.
- Update LoggerManager : now it creates one log file / day.
- Update logger properties.

In ElemUtils:
- Cosmetics in LoggerManager

In ElementaryUtils (trunk) :
- In FileUtils correct throw exception in read() method.

In ElementaryUtils (trunk) :
- Now closed message is handling by LoggerManager class as a log message instead of a std::cout message.

In ElementaryUtils (trunk) :
- Correct CustomException class implementation : now inherit from std::exception.
- Update CMakeLists to force C++11 : problem with SFML compiled library -> doesn't support C++98.

In ElemUtils:
- Fix initialization of CustomException.

In ElementaryUtils (trunk) :
- Correct what() implementation.

In ElementaryUtils (trunk) :
- Correct memory allocation in CustomException what() implementation.

In ElemUtils:
- Fix CustomException to avoid random error message due to string object being destroyed in the what() method.

In ElemUtils:
- some changes to CustomException

In ElementaryUtils (trunk) :
- Improve XMLParser : remove XMLAttribute class.

In ElementaryUtils (trunk) :
- Improve XMLParser : add emptyStartElement(...) method.