Linux: Fix Unity global menu bar stops working after minimizing calibre to the dock or the system tray. Fixes #1389404 [ubuntu unity global menu stops working with system tray icon](https://bugs.launchpad.net/calibre/+bug/1389404)
Sanitize the ImageMagick environment variables before launching external utilities. See #1389449 (ImageMagick scripts error when run from within Calibre)
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Refactor RightClickButton to make it globally available
Allow right clicking to popup menu on save current search button
start work
Recognize footnote links
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Loading of footnote link data works
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Initial implementation of footnote view dock
Close footnotes window when opening new book
Popup footnotes now work
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Also recognize links that are linked back to as footnote links
Add buttons to follow the footnote link and close the footnote window
When getting verified links handle links relative to the current file
Do not add anchors linked from the current file to linked_to_anchors