Update National Geographic Magazine
Fix sending by email not working on computers with non-ascii hostnames.  Fixes #1256549 [E-mailing has problems on French Windows installation](https://bugs.launchpad.net/calibre/+bug/1256549)
Implement mark as title page
Only operate on normalized unicodedata in the editor
Specific error message if file being tweaked does not exist
Integrate the new Tweak Book tool into the main calibre gui

The old Tweak Book tool has become "Unpack Book"
Preferences to control TB integration with calibre
Nicer error message when clicking new file if no book has been opened.
Preference to control tab width in the editor
Standalone executable for Tweak Book
Fix two problems in bulk search/replace:
1) S/R of datetime fields generated an exception
2) Using {template} as a source generated an error until the destination field was filled in.
Merge branch 'master' of https://github.com/cbhaley/calibre

Bulk metadata dialog: Fix search and replace on datetime fields
failing with an error.
Update the metadata download and Get Books plugins for ozon.ru

Changes in OZON.RU corresponding files due to API- and HTMLlayout
Changes from ozon.ru Addition improved search hit relevance calculation,
introduced configuration parameter.
...
Escape search string when showing message about searching.
Modify dirtied question if many dirtied editors present.

Also mark editors as clean when updating editors from container.
Make saving spinner not resize the status bar
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Remove references to Sigil from the manual and code
Implement saving of copies