patch, 5 partsUpdate tracking refs when pushing

This series allows git-push to update local tracking refs when it updates the remote heads it tracks. Along the way, it adds library code for holding the remote configuration.

Total diffstat is:

 Makefile          |    4 +-
 builtin-push.c    |  199 ++++++-------------------------------------
 commit.c          |    8 --
 git-compat-util.h |    8 ++
 remote.c          |  241 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 remote.h          |   25 ++++++
 send-pack.c       |   54 ++++++++++--
 7 files changed, 349 insertions(+), 190 deletions(-)

	-Daniel
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