Correct 'NETCDF4_VERSION'.

	modified:   config/cmake/FindNetCDF4.cmake
The 'FindNetCDF4 has been update'

From now it returns several usefull varaibles, as:
    - NETCDF4_VERSION
    - NETCDF4_INCLUDE_DIRS
    - NETCDF4_LIBRARY_DIRS
    - NETCDF4_LIBRARIES

TODO:
 - Add commentaries to the sources
 - Improve variable updating via cmake-gui