add some thoughts on sinks
newest experiment: inferring positional arguments from a format string (for Python 2.6 backwards compats and also mixing explicit and implicit positional arguments in newer Pythons)
make positional format arg tests a bit more formal, runnable on Python 2.6 (I think)
extracting arguments from format strings over here
grab some format arg types, then bed
add Callpoint class, and callpoint/function/module info to Message
add Callpoint tests
add repr to Callpoint and rearrange arguments real quick