This is used to check if we compile Fortran with PGI or Intel and to
then use the CPP wrapper script.

It would be nice to change this check to test for actual misbehaviour of
the preprocessor. TBD

Two issues: executable was named differently and the CI test names were
colliding

Enough is enough, C99 is not too much to ask in 2017

Supports multiple indexes now, to be used for non-tunable 'parameters'

Instead of listing all prerequisites multiple rules were added for the
same target, probably while doing a merge

Actually, the complex cases have not been checked so far.
Furthermore, there has been an inconsistency between setting

set("gpu",1)

and *NOT* setting a GPU kernel via the set mechanism. Then, the
default kernel (which is *NOT* GPU) has been used