Changes
Origin - a numerical expression specifying the origin of the arrow object:
2 - added by a study other then the current study, or drawn manually by the user
3 - added by any study, or drawn manually by the user
4 - added by the current study, or drawn manually by the user
5 - added by a study other then the current study
6 - added by any study
7 - added manually by the user
==== Notes ====
If the oldest (the first added) arrow object is deleted, the next oldest (the second added) arrow object becomes the oldest (the first added) arrow object.