This revision is essentially a bugfix release, but it also provides
new features:
- The installation of Scotch on Windows-like environments has been improved.
- Native Windows threads are now supported.
- The CMake compilation chain is now fully mature.
- New routines have been added, to run the upcoming "ScotchPy" Python interface for Scotch and PT-Scotch.

This is mostly a bugfix release. The bug fixing process lead to the design of a more efficient graph fording algorithm, that balances vertices better in the folded graphs.

Bugfix and refactoring of some internal modules

v6.0.6 Bugfix and refactoring of some internal modules