[GRASS5] Preparing 5.0.3 release

[Hamish]

> I have sync'ed *some* bugfixes from CVS HEAD into the 5.0.3 release
> branch (so no NVIZ changes, no PROJ changes as they'll go into 5.3.0).


Is r.series ready for public use? I've used it a bit and it worked fine;
it is missing a MAXFILE check though.


H