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.