Added ISDATETIME validator in tform_base.inc.php.

Till Brehm

2016-01-10 7adc6ceeeace6088f0ff68454201897b3fd83991

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ALTER TABLE  `sys_session` CHANGE  `session_id`  `session_id` VARCHAR( 64 ) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL;