Changes upgrade script so it only removes files inside the newscoop directory.

All files outside of the newscoop directory should be manually removed.
Also adds (old) Austrian translation to the file to be removed.
Removes old langguage dir completely (regardless of diff file)
CS-5530: Fixes issues when having multiple translated issues under 1 publication

Now doesn't assume default language to be publication language, when
there is only one publication.
Added a check that an issue should be selected before adding. If there
is no issue in the selected language it won't be possible to add an
article.
fix backup/restore
Remove printing of "1" after "Your Newscoop instance is upgraded from 4.2.x, roll 2014.05.06 to 4.3.x, roll 2014.09.24 without errors."
Merge branch 'v4.3' of https://github.com/sourcefabric/Newscoop into v4.3
Workaround lack of support for @ character in locales
Add correct codes for Serbia
Merge pull request #855 from danielhjames/v4.3

Rename sr@latin files to sh in v4.3 branch
Merge pull request #852 from takeit/v4.3

Remove printing of "1" after "Your Newscoop instance is upgraded from 4....
Merge pull request #847 from m038/v4.3

Changes upgrade script so it only removes files inside the newscoop dire...
Merge pull request #848 from m038/CS-5530

CS-5530
Merge pull request #853 from ahilles107/fix_backup

fix backup/restore
reenable php in smarty templates
CS-5536 - Fix confirmation form to display all fields
Merge branch 'v4.3' of https://github.com/sourcefabric/Newscoop into v4.3
Merge pull request #857 from takeit/v4.3

CS-5536 - Fix confirmation form to display all fields
Merge pull request #856 from ahilles107/reenable_php_in_smarty_templates

reenable php in smarty templates
adjust rmt config and clean detailed changelog
Enabled debug mode for silex app in upgrade.php only when the site is running in dev mode