transaction: allow generating file outside of store...
transaction: allow generating file outside of store
We allow a vfs argument to `addfilegenerator`. This allows generating files outside
of the store directory like bookmarks. However, this is not really working since
we do not have the infrastructure to backup and restore files outside of store.
By chance, the bookmark file is already backed up by another mechanism so we can
restrict this new feature to bookmarks (which is our only interest here) and
proceed.
