Kobo driver: Display device collections even if the driver is configured
to not manage shelves on the device. Fixes#1214233 [Collections are empty when not maintaining shelves on Kobo devices](https://bugs.launchpad.net/calibre/+bug/1214233)
Skip getting the shelf collections if the Kobo driver is not configured
to maintain them. This was wiping out the device collections.
RTF Input: Add option to ignore WMF images iinstead of replacing them
with a placeholder. Fixes#1213599 [RTF input conversion creates too large an image when failing to convert .wmf file](https://bugs.launchpad.net/calibre/+bug/1213599)
In OS X 10.8 Apple stopped redirecting stdout/stderr to Console.app for
applications launched by launch services. Re-enable the redirection,
useful for debugging.
Content server: Make virtual libraries available as searches from the
start page. They work just like saved searches, clicking on a virtual
library will show you all the books in that virtual library.
It was causing problems when there was exactly a screenful of items to
be displayed as the layout would bounce betwen having a scrollbar and
not having a scrollbar.
Allow customizing the comic metadata reader plugin via
Preferences->Plugins to read the series index from either the volume
or the issue number of the comic. Fixes#1211433 [comicinfo metada uses volume instead of issue](https://bugs.launchpad.net/calibre/+bug/1211433)
Add an option to display virtual libraries as tabs above the book list.
Convenient to quickly switch between virtual libraries. To enable, click
the Virtual library button and select 'Show virtual libraries as tabs'.
You can re-arrange the tabs by drag and drop and close tabs you do not
want. Right click on the tabs to restore closed tabs.
An improved cover trimming algorithm to automatically detect and remove
borders and extra space from the edge of cover images. To try it use the
"Trim" button in the edit metadata dialog.
