* New packages format lets you select source control system in use
* Packages file now includes root repo explicitly
* Scripts darcs-all and push-all updated for the new packages format only
* New sync-all script, intended for use after Git changeover and for buildbots right now
* Had to remove libraries/bootstrapping from tree since Git cannot track empty directories without a hack
* Determine checkout date with Git using Darcs fallback in aclocal.m4

It has some sort of Error Monad using the old Exception type.
I'm not familiar with it enough to know what the right thing to do
for it with extensible exceptions is.

It's now easier to add new repos anywhere in the source tree