Speculative work on SQLStatement

I had an idea about how to package args and statements together better.
Replaces a lot of existing SQL infrastructure, perhaps.  Remains to be
seen if it actually works practically.
More refactoring using dbrary.SQL.Statement
Back to generally working, now with sql"" interpolators
Make superuser "optional" (and assume it never dies)

Nearly reasonable, since party objects don't have it. At least fixes the
existing problems.
A couple remaining fixes

Spaces seem to have been the biggest losers in this change