[CFH] Remotes conversion script

  Hi,

  if someone is currently bored, it would be very nice to have a
conversion script for converting remotes/ to [remote] .config sections
(unless I missed it and someone already did such a great thing).

  I think about supporting just the [remote] sections in Cogito since
they are much easier to handle than the remotes/ file format, but in
order to maintain reasonable degree of compatibility with current
repositories (even freshly cloned since git-clone still generates those
horrible things ;-) ) such a script would be a must... and since this is
not interesting strictly for Cogito only, I hoped that perhaps some core
Git people would be interested to help here.

  PS: It would be nice if Git, when writing remote records during clone,
would note "this is supposed to just cover all the remote branches".
While Git does not support it now, in cg-fetch I would like to support
automatically picking up new branches in case you cloned all the
branches initially, but I need to distinguish the case when you are
interested in just a fixed set of those. BTW, I want to also remove gone
branches, but in line with the Git paranoia I'll just move the refs to
refs/remotes/*/.attic/ and let the user shoot at will.

  Thanks,