Disabled for now; when enabled it will allow faster collection
open and close in the normal case, while continuing to downgrade
when exporting or doing a full sync.
Also, when downgrading is disabled, the journal mode is no longer
changed back to delete.
This change would help me simplify the code of
https://ankiweb.net/shared/info/1983204951
It would allow my exporter to use the code of AnkiExporter while
selecting which decks I export, instead of exporting all decks as I
was doing until today. (I never realized I was exporting all deck
actually, until someone sent me a bug report)
This allows us to add a docstring to .append() so users can see
the names of the arguments that are being passed, and means we
don't have to remember to prepend run_ when calling a hook.
