Improvements to the query planner so that it makes better estimates of
+ plan costs and hence does a better job of choosing the right plan,
+ especially when SQLITE_ENABLE_STAT2 is used.
+
Fix a bug which prevented deferred foreign key constraints from being
+ enforced when sqlite3_finalize() was not
+ called by one statement with a failed foreign key constraint prior to
+ another statement with foreign key constraints running.
+
Integer arithmetic operations that would have resulted in overflow
+ are now performed using floating-point instead.
+
Increased the version number on the VFS object to
+ 3 and added new methods xSetSysCall, xGetSysCall, and xNextSysCall
+ used for doing full-coverage testing.
+
Increase the maximum value of SQLITE_MAX_ATTACHED from 30 to 62
+ (though the default value remains at 10).
+