org.csstudio.sds.ui: Added blue margin around displays to indicate
history mode
csstudio.sds.history: lots of tiny improvements
cssdutio.desy.css.product.log4j: Added logging categories to separate
logging of history bundles from the rest.
csstudio.desy.css.product.log4j: Added log4j category to write
registered channel listeners to file
org.cssdutio.common.trendplotter: Added functionality to control history
mode.
o.c.history: Some refactorings.
o.c.history.domain: Removed bug.