don't update media count when upgrading

fixes https://anki.tenderapp.com/discussions/ankidesktop/2770-error-message-while-importing-anki-1-deck-to-anki-2
change misleading note import msg
unbury from overview shouldn't unbury all decks
honor home deck's new card bury setting
support import of renamed .apkg files
tolerate windows trash errors
fix replacement of other clozes

https://anki.tenderapp.com/discussions/ankidesktop/2904-cloze-deletion-behaves-oddly-instead-of-giving-error-when-single-colon-is-used?mail_type=queue
Merge branch 'new_branch_name'