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  <rrusaw at gmail.com>

	* 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
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