quick fix for fronda - just populate article list and get the first page of article content
drop too old articles
remove fronda, as its new pages are impossible to parse

The first (solveable but resulting in monstrous overhead) problem is that articles don't have dates in feed nor category pages,
The second (not solvable for me) is multipage articles link to next page using relative links.
remove fornda's icon
pep8
Merge branch 'master' of https://github.com/t3d/calibre
Edit Book: Fix error when checking spelling if one of the files in the book declares an invalid (empty) language code. Fixes #1316170 [Spellcheck doesn't like ...xml:lang=""](https://bugs.launchpad.net/calibre/+bug/1316170)
New formatter function first_matching_cmp
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Merge branch 'master' of https://github.com/cbhaley/calibre
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SKip contractions ICU test as it is too version dependant
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Book polishing: If the books being polished have an ORIGINAL_EPUB/AZW3 format, warn the user that polishing will use it as the source and ask for confirmation. See #1316158 (Repost Enhancement Request: Polish Tool)
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Edit book: Allow copying the list of errors from the Check Book tool to the clipboard by right clicking on the list of errors
Port compiling of .ui forms
Port imports