Debugging in index facility
pep8
News download: Fix very long URLs for links to pages causing errors on windows because of max path length restrictions. Fixes #1313982 [Fetch failed from New York Times](https://bugs.launchpad.net/calibre/+bug/1313982)
Make the mem leak test for unrar more robust
ICU 53 no longer return the same collation order for numbers whose value is different even if they have the same first digit.
Edit book: Fix a hang when editing an HTML or XML file with text of the form <abc: (i.e. a tag name with a trailing colon). Fixes #1314009 [Editor: wrongly placed colon causes hang](https://bugs.launchpad.net/calibre/+bug/1314009)
Edit Book: Fix an error when merging CSS stylesheets that contain @charset rules
Fix #1313567 [Editor save button greyed out  after failed save](https://bugs.launchpad.net/calibre/+bug/1313567)
Fix incorrect color profile
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Update Private Eye
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Add a copy to clipboard action to the context menu for the spell check dialog
Fix recipe "nrc•next" (new URL etcetera)

Follows recent changes in news source "NRC Handelsblad"
Spellcheck dialog: Pressing Ctrl+C on the words list copies only selected words, regardless of current cell
Spellcheck dialog: Indicate whether a word is ignored in the Misspelled column
Easier debugging of syntax highlighters
Edit Book: Redesign the syntax highlighter to improve performance for large documents and extended editing sessions. Fixes #1314339 [edit book app "hangs" during edit session](https://bugs.launchpad.net/calibre/+bug/1314339)
Edit book: Make cursor movement smooth by not highlighting matching tags while the cursor is moving. Only match highlighting tags if the cursor stays still for a time.