formEditor.sql: Added ':S0' to make FormEditor more robust - no error message...

formEditor.sql: Added ':S0' to make FormEditor more robust - no error message in case formId can't be resolved, but still wrong behaviour.
Constants.php: Prepend '_' to SIP_MAKE_URLPARAM_UNIQ
Evaluate.php: phpstorm shows that 'getDebug()' is not used anywhere - commented.