[GRASS5] GRASS 5.3 release

[Hamish]

> > r.terraflow #if GCC>3.0 include rules            no, but works
> 
> Only compile r.terraflow if g++ is the compiler

That is what the GCC version check is for. I'm pretty sure if we (I)
conditionalize all the GCC 3+ includes, it will compile with cc. ?

http://article.gmane.org/gmane.comp.gis.grass.devel/2923
http://article.gmane.org/gmane.comp.gis.grass.devel/2932


> Fix r.terraflow makefiles so they work with alternate build mechanism

Beyond applying these changes to 5.3, what else needs to be done?

http://article.gmane.org/gmane.comp.gis.grass.devel/3662
http://freegis.org/cgi-bin/viewcvs.cgi/grass51/raster/r.terraflow/Makefile
http://freegis.org/cgi-bin/viewcvs.cgi/grass51/raster/r.terraflow/IOStream/lib/Makefile



Hamish