Cleaned and squashed merge of @ge-dong fork (#50)

* 	modified:   plasma/conf_parser.py
	modified:   plasma/models/builder.py
	modified:   plasma/models/mpi_runner.py
	modified:   plasma/utils/hashing.py
	plasma/models/torch_runner_dist.py

* 	modified:   plasma/models/mpi_runner.py

* 	new file:   plasma/models/torch_runner_dist.py

* 	modified:   data/signals.py
	modified:   plasma/conf_parser.py
	modified:   plasma/models/builder.py
	modified:   plasma/preprocessor/preprocess.py
	modified:   plasma/primitives/data.py
	modified:   plasma/primitives/shots.py
	modified:   plasma/utils/batch_jobs.py

* Revert some changes from fork to main repo master

* Code deduplication; use myhash for Shot.__hash__

* Cleanup Ge's changes to shots.py

* Start fixing PEP8 style errors in new file torch_runner_dist.py

* Fix remaining style errors in torch_runner_dist.py

* Assert is a statement, not a function

* Remove all shot lists from version control

* Fix more PEP8 style errors

* Fix remaining PEP8 style errors

* Add comments clarifying new datasets, signal tolerance, etc.

Rename gar18 to max_tol

Author: felker