Check steady state with file watching

Feature

• JobScheduler should check for incoming files from a monitored directory if such files are in a steady state, i.e. no process is currently modifying the files.

Maintainer Notes

• This feature is dismissed as no conflict-free implementation is foreseeable.
• For Unix systems there is no means to verify if a file is accessed by some other process or to prevent such action.
• Therefore a steady state check is based on assumptions, e.g. on a specific duration for which a file is unchanged.
• Individual conditions, e.g. based on the duration of a file being unchanged, are handled with individual jobs, e.g. the JobSchedulerExistsFile job that can be used as a first job node in a job chain.