Merge pull request #676 from takeit/v4.3

Demo data & tw-temp to master & installer fixes
Clear cache before using db with command, add real error output.
[api resource] add publication name and issue name to section response
[api_resource] revert public to protected
[api_resource] CS-4691: Slideshow hasn't attribute for source of image/video
Merge pull request #682 from ahilles107/CS-4691_slideshows

[api_resource] [fix] CS-4691
Merge pull request #681 from ahilles107/CS-4688_duplicated_sections

Cs 4688 duplicated sections
Merge branch 'master' of github.com:sourcefabric/Newscoop into v4.3