Condor updates for dingo_pipe

This includes several updates to improve HTCondor submissions with dingo_pipe:

Adds request_gpus = 1 to the sampling submission.
Additional requirements for the sampling submission (e.g., GPU memory) can also be specified in the .ini file, e.g,
```
sampling-requirements = [TARGET.CUDAGlobalMemoryMb>40000]
```
Adds an simple-submission = true that strips off submission keys priority, accounting_group, universe, and getenv. This was requested for the MPI-IS cluster.
Allows for global extra-lines list to be specified in .ini file.

dingo-gw / dingo