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Update markdown to 2.3.1.
Reading status wiped for older Kobo Touch firmware

Kobo driver: Fix reading status being cleared when connecting to a Kobo
with older firmware and metadata management set to automatic. Fixes #1230018 [Reading status wiped for older Kobo Firmware](https://bugs.launchpad.net/calibre/+bug/1230018)

When a Kobo Touch running a 1.9.x firmware was connected, the reading
status of all books was wiped out. This was to do with the way the
collections were managed. If a shelf/collection attribute was not
defined, the reading status was being cleared when it should not have
been.

Also skipping a loop over the books if shelf and series management is
not being done.
Merge branch 'markdown' of https://github.com/user-none/calibre

TXT Input: Update bundled python markdown library to 2.3.1
Fix breakage caused by update of markdown
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Fix over-wide buttons in preferences
Bulk metadata edit: Allow setting comments and cloning covers

Bulk metadata edit: Allow setting the comments for all selected books
and also allow cloning the covers. Cloning covers means that the cover
of the first selected book will be set for all other selected books.
Fixes #1230040 [Bulk edit covers and comments [Enhancement]](https://bugs.launchpad.net/calibre/+bug/1230040)
Correct handling of exclusions by tag when using non-english localization.
Merge branch 'master' of https://github.com/GRiker/calibre

Catalogs: fix exclude tags rules not working in non-English locales when
creating catalogs in EPUB/MOBI formats. Fixes #1228949 [Exclude books for catalogs not functional in German localisation](https://bugs.launchpad.net/calibre/+bug/1228949)
Exclude the markdown code from check
Avoid hangs when downloading covers due to misbehaving plugins
Delay load utils.date to speed up worker startup
Another fix for markdown update breakage
version 1.5
Fix #1231419 [error in manual page for "Integrating the calibre content server into other servers"](https://bugs.launchpad.net/calibre/+bug/1231419)
Driver for Sunstech reader

Fixes #1231590 [cannot connect my sunstech e-reader](https://bugs.launchpad.net/calibre/+bug/1231590)
Add a tweak to change the image compression quality used by the content server when it makes thumbnails.
Remove Bookoteka store, as they don't sell ebooks any more
Add some recipes of Uruguay.

Add 10minutos.recipe (News of Salto)
Add diario_el_pueblo.recipe (News of Salto)
Add diario_salto.recipe (News of Salto)
Add unoticias.recipe (News of Montevideo)