Mark boundaries between context groups
Fix #1270552 [Spelling mistake](https://bugs.launchpad.net/calibre/+bug/1270552)
Update Daily Express
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Fix #1270533 [Rename Orizon plugin to Cybook Orizon](https://bugs.launchpad.net/calibre/+bug/1270533)
Ensure that neighboring changes of the same kind are merged
Add some help to the new file dialog on how to create files in specific folders
Break up large replace blocks where possible and implement intra-line highlighting
Improve appearance by painting border lines for change blocks last and indicating context boundaries in the line number column as well
Refactor to support multiple diffs in the same view
Add support for showing multiple diffs
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Explicitly disable plugins when rendering HTML for covers. According to the Qt docs they should be disabled by default, but https://bugs.launchpad.net/bugs/1270297 implies they are not.
Connect change regions across the divider
Draw lines in same order on splitter handle as in views
Add a donate link to the readme
Edit book: Add a new tool to automatically remove all unused CSS rules.

Useful for books created from templates that can have large numbers of CSS rules that dont match any actual content. Available via Tools->Remove unused CSS.

Book polishing: Add an option to automatically remove all unused CSS
rules, works the same as the tool for Edit book, above.
Edit book: Handle EPUB files that erroneously list the OPF itself in the OPF manifest with an incorrect mime type
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Edit book: Add a tool to split HTML files at multiple locations automatically.

To use it, right click in the file and choose "Split at multiple
locations".  Useful if you want to split at all heading tags or all tags
having a certain class and so on.