Facility Set - Sample Log Saving - Save/LoadUB - Imports and minor issues

[mpatrou]

Short description of the changes:

The code includes the following changes:

• set facility to SNS (some cleanup too)
• add algorithms to Shiver category in Mantidworkbench
• save sample logs in the mdhistogram with options set in the config file
• change Mantid version in conda environment
• load UB from nexus for mdworkspaces.
• save UB as ISAW
• imports of Mantid algorithms defined in Shiver for pytest to avoid crashes of single tests

Related tests are added.

Long description of the changes:

Check list for the pull request

• I have read the [CONTRIBUTING]
• I have read the [CODE_OF_CONDUCT]
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

Manual test for the reviewer

References