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Implements Trac #4299.  Documentation to come.

Fixed Trac #4246

See Note [Partial export] for the details.
I also fixed one egregious bug that was just
waiting to bite: we were using loadSysInterface
instead of loadSrcInterface.

This resulted in an infinite loop in applyTypeToArgs, in syb

We still have
    insertList, insertListWith, deleteList
which aren't in Data.Map, and
    foldRightWithKey
which works around the fold(r)WithKey addition and deprecation.

Previously we were simply passing arguments of unlifted
type to a wrapper, even if they were absent, which was
stupid.

See Note [Absent error Id] in WwLib.

and adjust imports accordingly

The default should do into languageExtensions instead

This major patch implements the new OutsideIn constraint solving
algorithm in the typecheker, following our JFP paper "Modular type
inference with local assumptions".  

Done with major help from Dimitrios Vytiniotis and Brent Yorgey.