cogito-0.17.3

Whee, cogito-0.17.3!

Plenty of new stuff, mostly bugfixes - especially cg-admin-rewritehist
was particularily bug-ridden and Git 1.4.0 broke some backwards
compatibility, Cogito 0.17.3 should work smoothly with it again.

So, what's new?

* Many cg-admin-rewritehist bugfixes; note that -r semantics was
  changed to match documentation, -k steps in to mean what -r used
  to in practice
* Some documentation fixes
* Adjust to some Git 1.4.0 usage changes and new-style git-http-push
* Several other random things

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