I liked the Perl implementation of transactions, but managing state
between Perl and C is a bit cumbersome, so I've moved the whole thing
into C.
Also added a few statement configuration methods that currently don't do
anything yet.
Was expecting the implementation of this to get overly complicated and
brittle, but using a counter-based cookie and doing parts of it in Perl
made it pretty easy actually. Pretty happy with how this turned out so
far.
TODO: documentation -.-
