Log Message:
Update to Transmission-1.52.

GTK+ and Daemon
* Always honor the XDG setting for the download directory

GTK+
* Fix formatting error when showing speeds measured in MB/s
* Fix bug that caused some scheduled speed limit time settings to be lost
* Use the new blocklist URL when updating the blocklist

Web Client
* On the server, better filtering of bad URLs
* On the server, faster json serialization
* Fix "Remove Data" bug
* Fix minor web client 301 redirect error
* Better Internet Explorer support