Arbitrary call stack access for external debuggers changeset.

[Ryan Rusaw]

I sent in this patch in prior to the 3.0.0 release, but it never made
it in prior to the switch to mercurial.

2008-03-03  Ryan Rusaw  <address@hidden>

        * top_lev.h: Replace internal std::list with stl::deque in
        octave_call_stack to allow access to elements by position
        index via element_at () call.
        * top_lev.cc: Implement new element_at () call for updated
        octave_call_stack class
        * pt-stmt.h: Declare new tree_statement_stack class modelled
        after octave_call_stack class
        * pt-stmt.cc: Remove curr_statement and curr_caller_statement,
        and implement tree_statement_stack class to allow call stack
        statements to to be accessed by depth index.
        * error.cc: Replace references to curr_statement to
        tree_statement_stack::current ()
        * input.cc: Replace references to curr_statement to
        tree_statement_stack::current ()
        * ov-usr-func.cc: Remove references to curr_statement and
        curr_caller_statement

changeset.txt
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