runs a ctest -S script

ctest_run_script([NEW_PROCESS] script_file_name script_file_name1
            script_file_name2 ... [RETURN_VALUE var])

Runs a script or scripts much like if it was run from ctest -S. If no argument is provided then the current script is run using the current settings of the variables. If NEW_PROCESS is specified then each script will be run in a separate process.If RETURN_VALUE is specified the return value of the last script run will be put into var.