Allow colons in identifier values

Fixes #1224885 [<dc:identifier opf:scheme="URI"> and semicolon #2](https://bugs.launchpad.net/calibre/+bug/1224885)
Update Politika
Fix #1225552 [Windows portable executable file description should be "Calibre"](https://bugs.launchpad.net/calibre/+bug/1225552)
Book list should track edit metadata dialog

Fix regression in 1.3 that caused the book list to not track the
ecurrent book when using Next/Previous in the edit metadata dialog.
Fix #1225499 [non translatable "completed" for completed jobs](https://bugs.launchpad.net/calibre/+bug/1225499)
Have metadata.book.set_all_user_metadata actually set the metadata, not merge it.
Merge pull request #84 from cbhaley/master

Have metadata.book.set_all_user_metadata actually set the metadata, not ...
Conversion: Handle shorthand CSS properties

Conversion: Fix bugs in the handling of shorthand CSS properties
such as font or border, which could cause some properties to
not be resolved correctly during conversion.
...
pep8
pep8
pep8
Use shorthand properties for margin, border and padding
Merge branch 'normalize'

EPUB/AZX3 Output: Use shorthand forms for margin, padding and
border CSS properties

Conversion: Fix a bug that could cause incorrect border values to be
used when cascading, shorthand border CSS is present.
When copying books from library A to library B, check that B contains the necessary custom columns. If not, tell the user and allow them to create any non-conflicting columns. Inform them about conflicting columns.
Remove unused mount helper

Fixes #1225696 [Add patch to compile with CLANG](https://bugs.launchpad.net/calibre/+bug/1225696)
Allow a device to determine the compression quality setting for thumbnail generation
Commit the other two files
Handle broken code trying to set numeric columns with empty strings
Show a warning when copy to library is use don incompatible libs

Show a warning when attempting to copy books between libraries that do
no have the same set of custom columns. Fixes #1225484 [New feature: copy books between libraries with all custom metadata](https://bugs.launchpad.net/calibre/+bug/1225484)

Merge branch 'master' of https://github.com/cbhaley/calibre