Don't put parent function in subfunction stack structure name (bug #41506). * debug.cc (do_dbstack): When returning a structure, call octave_call_stack::backtrace with print_subfn set to false. * toplev.h (octave_call_stack::backtrace): Create new 2 argument function signature which calls do_backtrace with print_subfn set to true. Create new 3 argument function signature which passes print_subfn argument through to do_backtrace. * toplev.cc (octave_call_stack::do_backtrace): Change function to accept 3rd argument, print_subfn, which decides whether the parent function should be printed in the name field of the backtrace.

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