Fix penalisation/subsets (partially)
Update doc (sphinx)
Almost all tests ok except:
	 22 - mpi_test_advec_scales (Failed)
	 77 - test_advection_nullVelocity (Failed)
	 79 - test_advection_randomVelocity (Failed)

update, reorg and comments to prepare a pack to  send cmake files to ppm-team+ some stuff (draft) about ppm-client (vortex, Plouhmans)