If cached art from Eden exists, but no original url is available, map it to an unknown http address so that the art is maintained in Frodo. Required as themoviedb.org scraper caused actor art to be this way in Eden.
Issue #13810: This should fix the DELETE statement for MySQL (UNTESTED!).

MySQL does not allow for SubSelects on the table you are updating or deleting from. So we have to use a statement with joins instead. Unfortunatly DeleteValues does not support the needed syntax, so we just execute the plain query.
[rbp] Fix for timestamp problems commonly seen with avi files.
[jpegio] clarify and comment the reading code and handle the case of an expanding file.
Merge pull request #2057 from popcornmix/timestamp_fix

[rbp] Fix for timestamp problems commonly seen with avi files.
don't use the parent folder for art if the item is a folder item and has no slash at end
export art when exporting to a single file/folder structure
import art from a previously exported library
jsonrpc: only close the specified player (fixes #13936)
Merge pull request #2056 from skywalker666/master

Issue #13810: This should fix the DELETE statement for MySQL (UNTESTED!).