o.c.pvmanager.widgets: ServiceButton logs error

.. which was previously just ignored, making it hard to debug errors in
JDBC service calls.
org.csstudio.scan.ui.feature: Update version

.. because of tycho build?!
o.c.swt.xygraph: XYGraph removeTrace() didn't remove from axes

See https://bugs.eclipse.org/bugs/show_bug.cgi?id=445131
Merge remote-tracking branch 'origin/bug640' into sns
Merge remote-tracking branch 'origin/bug723_rhino_vs_jdk' into sns
Merge branch 'bug727_circ_buffer_clear' into sns