[epub] fix for calibre warning - cover does not need linear=no attribute

Calibre said „There are items marked as non-linear in the <spine>.
These will be displayed in random order by different ebook readers.
Some will ignore the non-linear attribute, some will display them at
the end or the beginning of the book and some will fail to display them
at all. Instead of using non-linear items simply place the items in the
order you want them to be displayed.”
[epub, mobi] fix for IT #3356 - new line char is problemtic in toc.ncx - replace it with space
Merge remote-tracking branch 'upstream/master'

Sync between librarian master and fork
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
[epub, mobi] Add early hyphenate support for powiesc, opowiadania and wywiad. TODO: language detection
[epub, mobi] hyphenator - added language detection and more hyph dictionaries
[epub, mobi] hyphenate all kinds of documents and annotation style improvement
fix impovement for IT #3356 - workaround rare problem
[epub, mobi] encode in utf-8 instead of entities. Result: smaller files :)
[epub, mobi] - xsl output impovements  required for better annotation visual rendering on Kindle Paperwhite
[epub] output improvements - clean xhtml instead of html tag soup
[epub, mobi] - tabs clean up plus media query amzn-kf8 helpful during kindlegen conversion
[epub, mobi]  book-text id – alignment with a rest of html output files
[epub, mobi] added optional command line switch helpful with kindlegen conversion
[epub, mobi] new switch use-kindlegen and html-toc switch improvement
[epub] removed flag with-full-fonts as it is not required any more
[mobi] not needed cover lines removed - epub intermediate file provides required cover; added support for second optional conversion tool - kindlegen
Fix for not working --verbose optional switch
Merge remote-tracking branch 'upstream/master'

merge upstream with my own fork