Orage can only import to default calendar

Orage 4.16.0 import via 'Exchange data' can only import to main calendar; there should be an option to set which foreign calendar shall be used as target, just as we can choose it when adding a new date manually.

Also Orage has the 'LoadFile' method accessible via DBus, to import .ics calendar files (e.g.qdbus org.xfce.orage /org/xfce/orage LoadFile "$FILE"), but that method accepts only a single parameter for the file. There should be an (optional) second parameter, for being able to set in which calendar it is imported, so that you can import into a foreign calendar by its name under which it appears in the 'Exchange data' → 'Foreign files' list (e.g.qdbus org.xfce.orage /org/xfce/orage LoadFile "$FILE" "my_cal_name").