Make JITL jobs capable of processing file order parameter

Standard jobs should be able to deal with file orders when used in a job chain which processes file orders.
If the current order is a file order and no other input file parameters have been specified, the job should use the scheduler_file_path file as an input file.

This applies to the following jobs:
-JobSchedulerCopyFile
-JobSchedulerExistsFile
-JobSchedulerMD5File
-JobSchedulerNotExistsFile
-JobSchedulerRemoveFile
-JobSchedulerRenameFile
-JobSchedulerFTPSend
-JobSchedulerHttpPost