Fix icu_character_name not working for non-BMP chars on windows
test for character_name()
PEP8
MOBI Input: Fix empty <a> tags not being handled correctly in rare cases when the markup is bad enough to be parsed only using the HTML 5 algorithm. Fixes #1288430 [Private bug](https://bugs.launchpad.net/calibre/+bug/1288430)
An option to multiple add books from inside a ZIP or RAR file. Right click the Add Books button and choose 'Add multiple books from archive'.