new upstream release. please signoff.
-Andy
SQLite Release 3.6.19 On 2009 Oct 14 (3.6.19)
Changes associated with this release include the following:
* Added support for foreign key constraints. Foreign key
constraints are disabled by default. Use the foreign_keys pragma
to turn them on.
* Generalized the IS and IS NOT operators to take arbitrary
expressions on their right-hand side.
* The TCL Interface has been enhanced to use the Non-Recursive
Engine (NRE) interface to the TCL interpreter when linked against
TCL 8.6 or later.
* Fix a bug introduced in 3.6.18 that can lead to a segfault when
an attempt is made to write on a read-only database.
