OPEN - task #201: logbook history support 
http://github.com/ControlSystemStudio/cs-studio/issues/issue/201

update olog client library 

Change-Id: I22ef1dfdbe7828f21d2b344a38ca115a4810ac07
OPEN - task #201: logbook history support 
http://github.com/ControlSystemStudio/cs-studio/issues/issue/201

Updating client

Change-Id: I017378519747840c81f82a3274fc0994c7a8b8b2
OPEN - task #201: logbook history support 
http://github.com/ControlSystemStudio/cs-studio/issues/issue/201

adding icons and fixing icon location in plugin.xml

Change-Id: Ica008df33cd395ce0325b1d92c1f5d7ff1cc8c2d
OPEN - task #201: logbook history support 
http://github.com/ControlSystemStudio/cs-studio/issues/issue/201

Fixing the Tree widget create model