Account for new nested folder structure in Tator

[robertgodfrey]

In Tator, each deployment is now its own section with a path of <EXPEDITION_NAME>.<DEPLOYMENT_NAME>, e.g. FSM_DOEX0094.DSCM_01. All of the logic in the annotation review program assumes that all deployments in an expedition are contained within a single section Need to:

• Change the name of the "Section" section to "Expedition"
• Modify the logic on the home page to look for paths with a value other than 'None', grab the first bit of the path, and make that the expedition option, grab the second bit of the path and make that the deployment option
• Rewrite a bunch of code to look for multiple sections instead of for deployment names

This will most likely be a breaking change, i.e. won't be able to revisit previous 'unnested' expeditions after these updates are made.

[robertgodfrey]

Holding off on making this change indefinitely