Removed handling of SQLException in macro; test case has been commented
Replaced buggy as[T] implementation with a working one that takes a function T => R
Ensured all references to inbuilt functions and types are preceeded with _root_
Added new test cases
Refactored old test cases
Some housekeeping
Converted PlainSQL API sql and sqlu to macro implementations
  in SQLInterpolation object by reusing code in TypedStaticQuery
Made minor changes to TypedStaticQuery object to support implementation of PlainSQL API