Import: Single and multiple author import flow

Testing and capturing import flow.

Importing a single author site to a single author site. Macnchrome using import data. Clean run.

 Importing a multi-author site to a single author site. Macnchrome using data. Import fails silently. Console shows “Unhandled promise rejection Error: Author mapping missing or incomplete.”

Todo: captions

#import, #importer, #needs-captions