Changing telemac2d architecture for finite volume

Reference issue

Description

The telemac2d.F subroutine has been duplicated in telemac2d.F for the finite element resolution method and telemac2d_fv.F for finite volume resolution method. Then the routines volfin1.f and volfin2.f no longer exists and the resolution steps are called directly in telemac2d_fv.F. The telemac2d_fv routine has also be cleaned from the specific routine from FE method.

Checklist

All Merge Requests:

• Update NEWS.txt to describe your changes.
• Run compile_telemac.py --check to check FORTRAN coding conventions.
• Run pylint to check Python coding conventions.
• If you added new files, run compile_telemac.py --clean --rescan and commit the updated cmdf file(s) accordingly.
• Run compile_telemac.py --clean for both normal and debug configurations.
• Run validate_telemac.py for both normal and debug configurations.
• Run validate_telemac.py --notebook for both normal and debug configurations.
• Run doc_telemac.py if there are any modifications in the documentation.
• Run damocles.py --eficas if there are any modifications in the dictionaries.

In addition, for a new feature:

• Check that your feature works in both serial and parallel modes.
• Add at least one test case to check the functionality (with documentation, graphics and VnV script)
• Update the documentation for the module in which your feature will be available.