Made many changes to include executable archives into the chat tutorial
new start page layout
added rss feed to webfrontend home
fixed a bug; added rss link to start page header
fixed rss icon
added help text to profiles; hiding restricted profiles
now showing an info when a restricted profile is selected
removed unused code
Made major changes to the chat tutorial. Python and the chat client will be installed using executable archives. The structure of the tutorial was changed to fit with this steps. Also the tutorial icon got updated
Made major changes to the chat tutorial. Python and the chat client will be installed using executable archives. The structure of the tutorial was changed to fit with this steps. Also the tutorial icon got updated
Merge pull request #532 from t-gerhard/profiles

Profiles
Merge pull request #533 from swuest/chat_tutorial_through_executable_archives

Changed the Chat tutorial to a Chat Tutorial via executable archives
Fixed site change
removed unused and duplicate element info entry
host_info element info entry is now always populated
Merge pull request #537 from dswd/fix-site-change

Fixed site change
moved style changes to a new class
made some internet buttons in the editor small
now using a flag "show_as_common" in external networks to decide which networks are common elements in the editor (like templates)
using on-screen labels for organizations, sites and external networks in filter dropdown boxes