Add Parallelization via MPI for Sec 33 source and GridMapper

[Linked-Liszt]

Overview:
This change adds new library files, scripts, and docs to parallelize the sector 33 grid mapping workflow. In short, the data is split by scan, and loaded with each process dynamically grabbing available scans. At the end of each operation, the data is merged similar to a merge sort operation and data is either re-shared or written to disk.

Relevant scripts have been added to /Scripts and documentation has been added to the existing sphinx project.

Implementation Notes:
Since parallelization brings many sharp edges, especially when it comes to loading data, the library files have been isolated into their own files. It would be possible to combine them with the main files using conditionals if it would be cleaner.

Future Work

• This same technique could be likely be applied to the powder-mapping workflow.
• Gui integration might be possible through the use of subprocess but would likely require significant changes to how the runs are launched and monitored.
• Further parallelization could be done on the sub-scan memory splits. However, this may require duplicate loading.
• Install process could be automated through a conda package