Cause the command-line shell to return non-zero if the final SQL statement
is incomplete.
Fix a potential problem in the whereRangeScanEst() routine when STAT4 is
active.  The problem was introduced by recent enhancements.
Simplify the code used to generate the text for EXPLAIN QUERY PLAN.
Add the estimated number of output rows to the EXPLAIN QUERY PLAN output
if compiled with SQLITE_EXPLAIN_ESTIMATED_ROWS.  This feature is off by
default for the time being.
Provide the new "-config CONFIG" option to the test/releasetest.tcl script,
which allows one to run a single test configuration selected by name.
When using the -config option to releasetest.tcl, default the testing type
to "fulltest" if it is not specified on the command line.
Changes to enable compiling using VC6.
Fix a failing test case in index5.test. Also tweak the way cache memory is divided between read-only and dirty pages when using SQLITE_CONFIG_PAGECACHE to reduce IO in some cases.
Restrict the scope of the explainIndexRange() function in where.c.
Account for the ASC/DESC properties of ORDER BY expressions when using the same index for GROUP BY and ORDER BY. Candidate fix for [ba7cbfaedc].
Remove an unnecessary conditional from the EXPLAIN QUERY PLAN logic.
Make sure that a GROUP BY that also implements an ORDER BY scans the table
in the correct order.  Fix for ticket [ba7cbfaedc7e6].
Require the SQLITE_ENABLE_RTREE compile-time option in speedtest1.c in order
to enable the R-Tree tests.
Simplification to the insertCell() routine in btree.c, resulting in a
performance boost and a very small size decrease.  It turns out that the
extra work involved in sometimes avoiding an memcpy() of the first four bytes
of a record takes more time than just unconditionally copying those
four bytes.
Performance optimization and very slight size reduction for OP_Column.
Remove the VdbeCursor.lastRowid cache of the current rowid, since maintaining
the correct cache value uses more CPU cycles than just recomputing the rowid
on the occasions when it is actually needed.  Replace it with the
VdbeCursor.aOffset field which used to be computed from VdbeCursor.aType
when needed. Saves 100 bytes of code space and runs 0.2% faster.
Remove the OPFLAG_CLEARCACHE flag from OP_Column.  In its place, change the
P3 parameter of OP_SorterData to be the index of the pseudo-table cursor whose
record header cache is to be cleared.  This gives a small size reduction
and performance increase.
Reduce the CPU load imposed by sqlit3VdbeCursorMoveto() by factoring out
some of its functions and by avoiding unnecessary calls.
Three small optimizations to vdbeaux.c.
Use the padding word in the Mem object as temporary storage for
serial_type value in OP_Record, and thus avoid a redundant computation of
the serial_type for each column.