Added backlinks from host_{element,connection} to element and connection
added method to list all elements of a certain host
Fixed entity deletion
external urls are now available as one dictionary in the backend api
[untested] editor now uses external help
Merge branch 'master' of ssh://github.com/GLab/ToMaTo into help_in_homepage
fixes
fixed help links
removed help pages
re-added license pages
Merge pull request #378 from dswd/host_entities

Host entities
Merge pull request #397 from t-gerhard/help_in_homepage

Help in homepage