text 1.2.*
Merge pull request #82 from silkapp/text-1.2

text 1.2.*
Unpackspec pc boilerplate
ExprArr: add Num instance.

Makes writing where/restrict expressions much nicer.
ExprArr: lower, coalesce, cast
Add isNotNull and isNotNullExpr
disable test suites
Dubious QueryRunner instance for nested Maybes