Allow the SQLITE_MAX_ATTACHED compile-time option to be larger than 62.  The
default limit on the number of attached databases remains 10.
Limit the maximum SQLITE_MAX_ATTACHED to 127, since a signed character
is sometimes used to store the database index.
For the OR-optimization, avoid generating OP_OpenRead opcodes that reopen
exactly the same index.
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.
Add support for parsing C-style hexadecimal literals.
Test cases for hex literals.
Reformatting a few test cases for clarity.
Casting hex literals directly from string to float always results in a
positive number.
Change the hex literal processing so that only the SQL parser understands
hex literals.  Casting and coercing string literals into numeric values does
not understand hexadecimal integers.  This preserves backwards compatibility.
Also:  Throw an error on any hex literal that is too big to fit into 64 bits.
Remove a surplus function prototype.  #ifdef code that is not used when
hex integers are omitted at compile time.
Updated documentation on sqlite3_temp_directory.  No changes to code.
Enhancements to the hex literal tests.
Add experimental "costmult" logic.  Only enabled when compiled with
-DSQLITE_ENABLE_COSTMULT.