Adding option for constraints, isles, refinement zones in salome_script.py create_mesh

Added one test case for each option + one with all of them. The one with all is not working issue with mesh script

For all we give a list of files each file containing one polyline/polygon.

For refinement zone the files must contains the three attributes (min_size, phy_size, max_size) in that order (the other is important when the file is not read with fiona). This is a temporary work around.