Update ports to use gcc42?

[Ryan Schmidt]

Now that gcc42 is a final release, what should be done with all the  
ports that depend on gcc41? Should they be updated to require gcc42  
instead? It's not very many ports:

devel/lua-numlua
gnustep/gnustep-base
gnustep/gnustep-make
lang/ftidy
python/py-numpy/Portfile
textproc/pdftk

There are also a few still using gcc40:

lang/ftidy
math/GiNaC
math/R
math/fftw-3-single
math/fftw-3
math/nestedsums
math/octave-forge
math/octave
science/libnc-dap
science/xloops
www/varnish
x11/fluxbox

Assuming gcc42 is capable of building each of the above ports, and  
that the port authors update these ports to use gcc42, is there a  
need to keep these old versions of gcc around? It's annoying enough  
for the user to have to spend a couple hours on an Intel Mac, or many  
many hours on a slower PowerPC, to compile a single version of gcc.  
It would be even more annoying if the user wanted to use various  
different ports, each of which required a different version of gcc.