Faster implementation for sqlite3MulInt64().
Improvements to a "Synopsis:" comment in the VDBE engine.
Fix the compound-select-to-subquery converter so that it works with the
new compound-select object linkage introduced as part of the fix
for ticket [31a19d11b97088296].
Fix a pointless conditional.  Add a test case.
Make sure that virtual WHERE-clause terms do not get transformed into real
terms when processing set of OR-connected terms.
Fix for ticket [4c86b126f22ad].