assignin not working

[John W. Eaton]

On 23-Aug-2008, Jaroslav Hajek wrote:

| in current development tree, assignin is not working due to invalid
| scope (-1) used in call to symbol_table::varref. I think that the
| default (current) scope should be used, because
| octave_call_stack::goto_caller_frame () sets the current scope.
| Attached it a patch and it seems to fix the problem.

I applied this changeset.

Thanks,

jwe