close subwindows when close the application (not yet well propagated when any of the subwindows closes only itself).
use splitters between the widgets in the newer AttrRamp and DeviceEvents.

git-svn-id: svn+ssh://controls01/siciliarep/svn/trunk/tango_client/ctlinac/trunk@13176 a18efa20-c439-0410-bf20-9b91ec695b4c