Fix embedded fonts not working in preview panel

Add the embedded fonts to Qt and prevent web kit from loading them to
workaround the bug in qt webkit.
Busy cursor when fixing/prettying all files
Busy cursor for split and merge
Show an about message when the preview panel is cleared
File open dialogs; If the previously used initial directory, no longer exists, use a directory one level up. Fixes #1255216 [Adding book or new format opening Windows\System32 folder as default](https://bugs.launchpad.net/calibre/+bug/1255216)
Kobo driver : support new firmware version 3.0.1

Kobo snuck out new firmware 3.0.1. This has no changes that affect the
driver. As Kobo have done this a few times recently, I am setting the
supported version to 3.0.5. This will allow for a few small bug fix
releases. Fixes #1255363 [Unable to transfer to Kobo Touch](https://bugs.launchpad.net/calibre/+bug/1255363)
Edit metadata dialog: Add special author edit

Edit metadata dialog: Facilitate editing the authors for books that have
a large number of authors, by using a dedicated "Edit authors" tool, which
you can launch by right clicking the authors in the edit metadata dialog
and selecting "Edit authors". Fixes #1255288 [[Enhancement] Display authors in editable popup window](https://bugs.launchpad.net/calibre/+bug/1255288)
Expand shorthand properties in filter CSS

Conversion: Fix specifying shorthand properties in filter css not
working. Now all shorthand properties automatically filter out all the
properties they are shorthand for.
Merge branch 'master' of https://github.com/cbhaley/calibre

Wireless device driver: Cache metadata on a per device basis. Allows for
using different cover thumbnail sizes on different devices. Will force
device to resend all metadata the first time it is connected after this
upgrade.
Clean up the CC version check a bit.