Waves 2.0.0

Context

This MR removes the compatibility with python 2 and adds the capability to easily link another code to waves using CMake, as well as a feature to read results from the disk.

Changes

• Remove all import from the future libs of python, the code is now compatible with python 3 only
• Add a waves-config file allowing to easily find and link waves to another code using CMake
• Add a load method to GmshImport to read results from the disk (restart/checkpoint feature)
• Add a UnitTest class to test the classes and methods in tbox which can not be accessed directly through python
• Rename katropton to katoptron, although this was done in !59 (merged), it was not referenced by a tag
• Various minor cleaning and bugfixing

Comments

• The GmshImport and GmshExport classes need to be upgraded to deal with gmsh format 4, as well as to read and write data in binary
• The new method GmshImport::load contains a lot of repeated code, similarly to GmshExport::save, there might be a way to improve this

Tests

Passed on ubuntu20.04 (python 3.8.2), and msys2 (python 3.8.1).