[DRMAA-WG] Torque/PBS DRMAA - signals

[Rajic, Hrabri]

Issue:

We recommend offering a new routine for sending signals to submitted
jobs. A lot of DRMs support various signaling mechanisms that can be
used for applications steering.  

For instance, it could enable forcing application-level checkpointing,
dynamic application image saving or other specific application behavior.
Mentioned routines would help to create sort of batch-like application
streaming relevant in some application use cases.
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This is clearly a future versions work at this moment.

-Hrabri