Set busy cursor on long job
Add instructions on setting environment variables in OS X
Bump firmware version for Kobo Touch driver

New firmware version released, updating versions to match.
Fixes #1245707 [Update to support Kobo firmware 2.10.0](https://bugs.launchpad.net/calibre/+bug/1245707)
Use <h2> for inserted ToC title for MOBI and PDF as well

See #1245076 ([Enhancement] Add PDF TOC Title, More Margin Options and ePub TOC Heading 1)
Remember window size of comments editor dialog
Start work on the editor component for Tweak Book
Pre-create error formats
Highlight cursor line
Keep only useful entries in the color theme
Line numbers
Bulk metadata edit: Fix clearing of series and publishers

Bulk metadata edit: Only clear series if the clear series checkbox is
checked. Also add a clear checkbox for publishers, so that publishers
can be removed. Fixes #1245058 [Calibre is deleting Series field even when it's not being modified](https://bugs.launchpad.net/calibre/+bug/1245058)
Method to launch editor widget in its own dialog
Syntax highlight namespace prefixes
Amazon metadata download: Fix spurious ratings for unrated books

Amazon metadata download: Fix spurious ratings being returned for
unrated books. Fixes #1245449 [Amazon source picks up ratings from ANY book on the page (suggested etc)](https://bugs.launchpad.net/calibre/+bug/1245449)
Merge branch 'master' of github.com:kovidgoyal/calibre