copy CHOP me.copyIndex attribute

Hello,

I was messing around with the copy CHOP recently since having understood how stamps work and noticed that the me.copyIndex attribute is not implemented as it is in the copy SOP.

IMO, this is a needed feature when using it with timeslicing set to off.

Thank-you!
Owen

This will be in the next release, build 2020.20810 or later. Thanks for your patience!

Selina