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Updated documentation to show example on how to disable foreign key constraint exporting for individual models.

Reverted changes for disabling foreign key sql exporting. Not needed since it can be done with attributes.

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The bug does appear if you clean the identityMap from the Group table before querying the DB

Again... Prevent quoting two times the table name, bug report by g00fy on irc, seems like this bug could be on other drivers as well

Added some user functions (trim, ltrim, rtrim, sha1), the trim function prevented the tests from running

If you hada base Doctrine_Record class that implemented a Template and some classes
that inherited from this one using single table inheritance, the export process
failed because it tried to create several times the same table

Ticket: 423

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* added tableName option
* added deleteAll and createTable methods
* fixed fetch method
* fixed a bug with expire time in save method