v11 attached.
- TAP tests passing (the big glitch was that indexes that are used in constraints should have their stats dependent on the constraint, not the index, thanks Jeff)
- The new range-specific statistics types are now supported. I'm not happy with the typid machinations I do to get them to work, but it is working so far. These are stored out-of-stakind-order (7 before 6), which is odd because all other types seem store stakinds in ascending order. It shouldn't matter, it was just odd.
- regression tests now make simpler calls with arbitrary stats to demonstrate the function usage more cleanly
- pg_set_*_stats function now have all of their parameters in the same order as the table/view they pull from
