KPP testing and quality control

[rs028]

The last official version of KPP is v2.2.3, released in November 2012.

There have been several modifications, mostly by R. Sander and J. Bock (see repo on https://bitbucket.org/gcst/kpp), and then several more customizations specific to Mistra by J. Bock. Some of these modifications are not well documented (as a matter of fact, the KPP codebase is not well documented in general).

It would be good to run some tests and to review the code, especially wrt the modifications since v2.2.3, to make sure that bugs have not been accidentally introduced and to increase confidence in the code.

A general cleanup of the codebase would also be good. There are several parts of the code and entire files which are leftover or backups of previous versions and could be safely deleted.

This is a big project and requires good knowledge of Fortran and C.