Add support for audit imports
Misc cleanups to otm1 migrator

Add comments and reorganize module

DRY out plot/species/tree imports

Simplify forloop with a generator Instead of having a continue statement

Move user_field_to_try logic into user save method

Make dependency rewriting cleaner and faster

Rename MODELS and cleanup lint
Merge pull request #1024 from steventlamb/topic/otm1_audit_imports

Topic/otm1 audit imports