added TAB define
removed Validate() functions - don't like having so many in different files
added isClass() and Validate() functions to Utils class
  works well with php_error.php
added $headings argument to __construct() function for datatables_Tables class
  also added addRow() function - possibly for use when in inline mode, not with ajax mode

git-svn-id: http://prositemanager.googlecode.com/svn/trunk@36 e374cdb8-7ee8-0d77-fd1e-c554042f9154
removed Validate() function from classes

git-svn-id: http://prositemanager.googlecode.com/svn/trunk@37 e374cdb8-7ee8-0d77-fd1e-c554042f9154