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transaction: support multiple, separate transactions

Solves that committed (closed) transactions may linger and be returned
on subsequent transaction calls, even though a new transaction should
be made, rather than a new nested transaction.

This also fixes a race condition with the use of weakref.

Basic install:

 $ make            # see install targets
 $ make install    # do a system-wide install
 $ hg debuginstall # sanity-check setup
 $ hg              # see help

See http://www.selenic.com/mercurial/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.