improve the CircularBuffer to prepare it to be used for tasks like 17b (take action if leakcurrent is too big during N configurable seconds).
add a wait time on switch on procedure to avoid 'from' ramp setpoint lost. As well as it has a post switch on delay to avoid overcurrents.
improve the vesioning labelling.

git-svn-id: https://svn.code.sf.net/p/tango-ds/code/DeviceClasses/AcceleratorComponents/LinacAlba/trunk@18882 3b39871e-fe4b-0410-b5db-e82997f68959