Add the Docker image and update the installation doc

Ugly fix the difference between 64 and 32 bits machine (change everything to int32, and rounded the )

Split the unittest in 'core' for the main functions, and 'images' for the functions related to the generation of the images

If the content of the 'g' paramter is modified and/or returned by the function, the work is done in a deepcopy-ed object (because of PyUnit test simplicity)

Move the conversion of the TPSCy projection grid data from the TPS module to the TPSCy comiled module

Soft deprecation of the TPS_Grid() and TPS_Image() function, replaces with the TPS_grid() and TPS_image() functions