There is a function in the tree_statement_list class called
list_breakpoints. It is used in debug.cc in the dbstatus() function,
but I have a few questions about it. In the statement tree, it appears
as if there is a list of breakpoints for each file. Then, my question
is whether the octave_value_list returned by
tree_statement_list::list_breakpoints() is just a list of breakpoints in
a single file? If so, it there a more overreaching function that gives
a (filename,linenumber) list of breakpoint in octave, or must one walk
the statement tree every time to ascertain all the breakpoints?