Enhance the comment on whereLoopAddBtree().  No changes to code.
Expire prepared statements after running ANALYZE.
Enhance the sqlite_stat1.stat parsing to allow additional text parameters
at the end.  Unrecognized parameters are silently ignored.
Correction:  The maximum SQLITE_MAX_ATTACHED value to avoid overflowing a
signed 8-bit integer is 125, not 127.
Fix the index name for the shadow tables in the spellfix1 extension so that
multiple instances of the spellfix1 virtual table can each have their own
index.
The optimization of check-in [b67a6e33f2] does not work (it generates
incorrect VDBE code) if an OR term is AND-ed with a constant expression.
So back that optimization out and add a test case to make sure it does not
get added back in.
Add the OP_ReopenIdx opcode that works like OP_OpenRead except that it becomes
a no-op if the cursor is already open on the same index.  Update the
OR-optimization logic to make use of OP_ReopenIdx in order to avoid
unnecessary cursor open requests sent to the B-Tree layer.
When running ANALYZE, it is not necessary to check the right-most key column
for changes since that column will always change if none of the previous
columns have.