[scripts] Add features to MascaretGeoFile class

Add reading of topo-bath information which is given by a string in the
geometry file for each points of each profile ("B" stand for bathymetry
and "T" for topography). This information is used to mark the limits
between minor and major bed.

Add reading Courlis geometry files (geoC and georefC)

Add an option to the class to activate or desactivate loading of the
file

+ some syntax corrections