add {{Subdeck}} special field

If the deck is a several levels into a tree, it can be needlessly
verbose to list them.
Merge branch 'master' of https://github.com/dae/anki
catch more invalid zip file errors
make sure we set usn when pulling in dconf from apkg
comment out high-dpi+transparent latex example
remove backspace to delete shortcut on macs

too many people activating it accidentally
bump version
reduce sync chunk size
bump version
Merge branch 'master' of https://github.com/dae/anki
fix inconsistency in default note type names

The value used internally was changed at some point and the text that
was added to the GUI was not.
be explicit about modSchema()'s check flag

- remove gui code that adds exceptions for syncing
- use check=False for all syncing and upgrade code
cont should be checked befoer any further processing
Load saved searches list in sorted order