New features
Edit book: Insert image dialog: Add buttons to change the image thumbnail size.
Book details panel: Allow right clicking on a format to open it in the calibre editor.
Edit metadata dialog: Allow viewing or editing specific formats by right clicking the format in the formats list.
When creating a metadata jacket allow HTML in custom long text columns.
Content server: When editing metadata add a button to remove the existing cover. Note that after removing the cover a auto-generated cover is displayed instead. You might need to hit refresh in your browser to see the change.
Content server: Date edit: Add buttons to clear the date or set it to today's date.

Bug fixes
When showing books on the device, disable keyboard shortcuts for actions that operate on library books.
Content server: Custom List: Fix a zero series index being displayed as one.
Content server: Fix covers not being updated in downloaded copies of some books.
PDF Output: Fix an error that could occur in rare circumstances when using the option to read page margins from the input document.
Edit book: Check book: Fix an error if a filename contains a % character.
PDF Output: Fix CSS opacity property causing text to not be rendered. Now opacity is ignored, as it is unsupported by Qt WebKit.
Create custom column dialog: Ensure that the format numbers field is always .