#103 Unregister the PortOpenCloseEx in TApdDataPacketManager.Dest

[Alexander Muylaert]

register a packet.
unregister a packet.
register a packet.
close the comport. > AV

Since you allways set the comport to nil inside the unit, you never call the unregister of the callback anymore.

This causes an av later on when reopening / closing the port.

[Alexander Muylaert]

altered adpacket