export images from .dia files
add some collaboration diagrams
export some more images from .dia files
add documentation chapter summaries for ch. 4 and 5
Update doc
Add chapter 6 and 7 to doc
Documentation compilation
xMerge branch 'Web_Interface' into development
Add participants to appointment
New appearance
Merge branch 'development' into Web_Interface
Merge branch 'development' into Web_Interface