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PDF Output: Fix incorrect rendering of html files with only a single large image and very little text. In some rare circumstances, the full html file would not be rendered. Fixes #1278877 [conversation EPUB to PDF - Error](https://bugs.launchpad.net/calibre/+bug/1278877)
Kobo driver: Add support for soon to be released firmware version 3.2

Kobo are about to release firmware 3.2.0. The beta and release
candidates have been tested with calibre and the version number is all
that needs to change. But, I am bumping it to 3.2.1 as Kobo have been
doing a second bug fix release with no backend changes. Fixes #1279190 [Update to support Kobo firmware 3.2.0](https://bugs.launchpad.net/calibre/+bug/1279190)
Only recompile coffescript if the source has actually changed since the last time it was compiled, rather than relying on mtimes.
Edit book: new tool to automatically generate an inline (HTML) Table of Contents based on the current NCX Table of Contents. Accessed via Tools->Table of Contents->Insert inline Table of Contents.
Fix various bugs in the EPUB version of the User Manual and add workarounds for proper rendering in Adobe Digital Editions
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Cleanups for the quick start guide
More accurate detection of full screen layouts in paged mode
Fix spurious detection of hold gestures
Fix gesture detection problems caused by Qt not reporting touch point co-ordinates in the ewidget co-ordinate system correctly
Preferences: When using the Restore to defaults button for the Tweaks, remove all plugin tweaks as well. This allows the user to recover the tweaks file if one of the plugins insert invalid code into the plugin tweaks
Edit Book: Add a check for links that do not point to HTML documents
Change some User Manual images to scale dynamically with the viewport width
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JSBrowser: Add API to download upsupported content
JSBrowser: Allow downloading files by clicking web page elements in addition to supplying a URL
Update NRC Handelsblad (subscription version)

Fixes #1276962 [Private bug](https://bugs.launchpad.net/calibre/+bug/1276962)