o.c.diag.epics.pvtree: Allow multiple instances
o.c.diag.epics.pvtree: Remove unused doc.zip
o.c.diag.epics.pvtree: Support 'aSub' record, simplify preferences

Can now use 'INPA-L' instead of 'INPA, INPB, ...'
o.c.diag.epics.pvtree: Support context menu with multiple PVs in
selection