Export: Work on basic emails
Export: Start factoring out output format

- Inbox is exposed
- Starred messages are exposed
- Folder names are escaped properly
- Chats are exported
- Progress messages are printed
Export: Add mbox support
Export: Fixup TODO, log messages
Merge branch 'export' into export2

Conflicts:
	src/gmv/gmv_cmd.py
Small export fixups

- Fix imports
- Fix typo in close()
Export: Better label handling

- Don't include All Mail by default
- Allow the user to specify which labels to export
Export: Allow listing all labels
Revert "Export: Allow listing all labels"

This reverts commit a82ec58a4eb55b3deecf4b7608b2030df6f087d6.
Better logging
Remove inline TODOs
Export: mbox allows empty intermediate folders

Also fix typo in folder iteration
Merge branch 'gmv-perf-1.7.2' into export2
Export: dovecot compatibility fixes
Merge branch 'vasi-orig-export2' into vasi-export
work on export
start adding more info in export
Merge branch 'gmv-perf-1.7.2' of github.com:gaubert/gmvault into vasi-export
Merge branch 'gmv-perf-1.7.2' of github.com:gaubert/gmvault into vasi-export
add export epilogue