Add fixities to module interfaces
Move OpTable into IParser user state
Add iParse that takes a table
support cross-module OpTables
Turn off custom OpTables for now
Properly turn off custom OpTables

oops!
Revert 95ec3a8..1a093ac

This rolls back to commit 95ec3a822edeb97e667aab96996cc08aa8f605a9.
Nicer API for embedding Elm programs
Move variable renaming later in compilation.