Proper handling of multistatus task results

 * Also fix exception handling in execution context
 * support for copying messages from the tree via context menu
 * support for tooltips

Change-Id: Ie85a09a049eca3dbc872280f4018a737d1181b25
Signed-off-by: Markus Duft <markus.duft@ssi-schaefer.com>
13 files changed