rs/ref-transaction

"Use ref transactions", part 3

Ronnie explains:

	This is the third and final part of the original 48 patch
	series for basic transaction support.  This version implements
	some changes suggested by mhagger for the warn_if_unremovable
	changes.  It also adds a new patch "fix handling of badly
	named refs" that repairs the handling of badly named refs.

This includes some improvements to the transaction API (in
particular allowing different reflog messages per ref update in
a transaction), some cleanups and consistency improvements, and
preparation for an implementation of ref renaming in terms of
the transaction API.

It also improves handling of refs with invalid names.  Today "git
branch --list" and "git for-each-ref" do not provide a way to discover
refs with invalid names and "git branch -d" and "git update-ref -d"
cannot delete them.  After this series, such bad refs will be
discoverable and deletable again as in olden times.
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