Add a test case contributed on the mailing list
that works in NGQP but fails in legacy.
Performance tweak to whereLoopInsert().
Minor performance tuning of the NGQP.
Performance improvement for the OR-clause analysis in the NGQP.
Move the definitions of the WhereLevel and WhereInfo objects out of
sqliteInt.h and into where.c.  This will facilitate future refactoring
of the internal query planner data structures.