Big refactoring for PHP JOM_Job class: now table fields are contained in an array: it defines field name, PDO: constant type value and other useful attributes. Created jom_pdo__ functions in generic_lib.php to generate fields lists and do parameters binding. Refactored requests_job.php to reflect above updates. Added table_definition.php in cfg file (could be merged with table_configuration contained in inst folder, used in the installation procedure?). Update job_list.js script for the above reasons