[courlis][scripts][mascaret] 2021 developments for COURLIS (and MASCARET/PYTHON scripts)

COURLIS developments :

• New bedload tranport formula added (Lefort2014, Recking2013, Recking2015)
• New option of equilibrium slope for upstream boundary condition for the bedload module
• New option for the calculation of energy slope (which is the default option now)
• New test-cases for bedload transport formula
• Fixes in Fortran and in some test-cases

MASCARET developments :

• New option for numerical scheme in Sarap "decentrement" which allow a speed-up in some Courlis calculation
• New mascaret.dico file which includes Damocles keywords for MASCARET, TRACER and COURLIS (used by Python script to

PYTHON script developments :

• New feature to convert xcas file into Damocles case file format (and vice versa)
• New feature to launch calculation with Damocles case file format (by conversion of cas file into xcas file)
• Add some options to "extract_ptravers_res_to_geoc" option of converter.py