Adds site admin section to migrate data from Gallery 1.x.
- Provides a wizard to migrate a Gallery 1 to a Gallery 2 installation. (Import wizard in Site Admin -> Import: Gallery 1)
- Stores a mapping of all Gallery 1 URLs to Gallery 2 item ids (URLs).
- Imports Gallery 1 albums with most Gallery 1 data / features.
Missing: Gallery 1 ratings are not imported yet.
See: Gallery 1 to Gallery 2 Migration Guide