Data persistence in the COEUS engine

[lukemartinlogan]

Hermes right now is only temporary state. When Hermes dies, the data stored by COEUS dies too. We need a way to export data from COEUS to the PFS.

Additions to XML Files:

1. Add a parameter to define the debug file location (e.g., "export.bp5").
2. Add a paremeter to define which engine requires persistence

Additions to COEUS code

1. During Put, track all modifications that have been made within a step (variable name, shape, offset, count)
2. During EndStep, check if this is the last step and if so iterate over all modifications, get the blobs from Hermes, and then store them into a BP5 file.