Hello.

I've finished Martin's work and put the 2 aliases into files. The git-undescr.sh is basically
unchanged, while I added better option parsing for git-descr.sh script so that it supports:

$ git gcc-descr
r12-6895-g14f339894db6ca

$ git gcc-descr HEAD~10
r12-6886-geaa59070343326

$ git gcc-descr HEAD~10 --long
r12-6886-geaa5907034332649c918f0579da805b6e786aa47

$ git gcc-descr --short HEAD~10 --long
r12-6886

$ git gcc-descr --short --short --long HEAD~10
r12-6886

Ready to be installed?
Thanks,
Martin