Cmake -- Possibility to configure, compile, install and package HOS-NWT with cmake

This branch adds the possibility to configure, compile, install and package HOS-NWT with cmake

Some modifications have been added to the code, so that it compiles with Gfortran 4.9.2 under MinGW 32 Bits

From `cmake` directory, it is possible to build the project with the following commands

    mkdir -p build
    cd build
    cmake .. -G"Unix Generator" -DCMAKE_BUILD_TYPE=Release
    make
    make install

If a path to FFTW or Lapack library has to be given, one can call `cmake` with the following arguments
 `-DFFTW_ROOT=/path/to/fftw` and  `-DLAPACK_ROOT=/path/to/lapack`