#477 Can't copy a data object.

[Bernard Hurley]

If I create a data object and try to copy it, then a new one is not created under the cursor and if I click on the canvass I get and error message something like:

=================
std::bad_cast
std::bad_cast
while executing
"minsky.op.clickType 808.0 247.0"
("eval" body line 1)
invoked from within
"eval minsky.$procname $args"
invoked from within
"if [llength [info commands minsky.$procname]] {return [eval minsky.$procname $args]}"
(procedure "::unknown" line 17)
invoked from within
"$item.clickType $x $y"
(procedure "deleteTooltipIfLeft" line 5)
invoked from within
"deleteTooltipIfLeft $item $id"
(procedure "itemEnterLeave" line 25)
invoked from within
"itemEnterLeave op 50 op50 0"
(command bound to event)
===================

This happens whether or not this is the only widget on the canvass and whether or not a datafile had been imported.

[High Performance Coder]

Verified on my system.

[High Performance Coder]

Missing clone method on DataOp