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)
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Fix ipython({...}) not applying specified user namespace
Update Associated Press
Specify how many files will be deleted when right clicking to delete files in the book editor
Plugin mirror script: Add a timeout so that the script does not hang if the network or the source server goes down