Change the description of how sqlite3_progress_handler() works so that 
the N parameter is "approximate".  This aligns with the current implementation.
This is a documentation change only.  No changes to code.
Make sure the shell does not try to put a zero terminator on the end of an
unallocated zero-length string when running ".import" on an empty file.
Add the sqlite3_cancel_auto_extension(X) interface which will undo a prior
call to sqlite3_auto_extension(X).
Enhance the query planner so that it looks at multiple solutions to OR
expressions in the WHERE clause.
Make sure the sqlite3_prepare16 and sqlite3_prepare16_v2 interfaces do not
read past a zero-terminator if the nBytes parameter is too large.
Clear the error string pointer in sqlite3_vtab object after the error string
is transferred to SQLite.  Ticket [78588b938a11].
Enhance the sqlite3_analyzer tool to give reports on the sizes of individual
indices.
Fix copy/paste errors in comments in the transitive_closure virtual table.
No changes to code.
Documentation changes to warn that sqlite3_set_auxdata() might call the
destructor even before it returns.  Also fix the regexp extension to deal
with that case.  Ticket [406d3b2ef91c].
Fix a 8-byte alignment problem in the query planner that might cause
problems on sparc when compiled with -m32.
Ensure that all auxiliary data registered by calls to sqlite3_set_auxdata() is destroyed when the VM is halted. Partial fix for [406d3b2ef9].
Fix a typo in the previous commit.
Ensure that all auxiliary data registered by calls to sqlite3_set_auxdata() is destroyed when the VM is halted.
Improved documentation for sqlite3_set_auxdata().
Ticket [406d3b2ef91c].
Remove unused "codec" code from the command-line shell.
Fixes to test numbering.
Add 'queryplantest' target to the MSVC makefile.
Enhance the progress handler so that it keeps track of the number of VDBE
cycles across sqlite3_step() calls and issues callbacks when the cumulative
instruction count reaches threshold.
Fix a typo in main.c: SQLITE_DEAULT_AUTOMATIC_INDEX -> SQLITE_DEFAULT_AUTOMATIC_INDEX
In the command-line shell, work around the fact that popen() and pclose()
are not defined in stdio.h. in C89 and later.