Add the missing operational tools for the WMAT0

Add the two missing SLS alarms:

- Simplified version of the paused jobs alarm, since WMStats provide most of the information
- Rewritten long jobs alarm that is independent of the batch system and more descriptive

Also refactor the directories to follow usual conventions in bin (no .py extension) and remove
the operations directory to make sure that the SLSAlarmsConfig is shipped in the rpm.

@hufnagel, @samircury Please review, this is already deployed in the running WMAT0 and I think it's pretty much the last of SLS alarms development. We just need to write down a twiki on how to use/configure/monitor these.