Update of documentation (mainly design)
Update of documentation (mainly design)

Signed-off-by: Michael Heil <bb5e98d7bb63e9e3d4363b6e2c6b645135445b3f@chello.at>

openengsb/openengsb,openengsb/openengsb,openengsb/openengsb,openengsb/openengsb,openengsb/openengsb,tobster/openengsb,openengsb/openengsb,tobster/openengsb,tobster/openengsb,tobster/openengsb