[Proposal] 'd' and 'D' debug.getinfo switches

["Soni L." <fakedme@...>]

Would be nice if debug.getinfo(1, 'd') and debug.getinfo(1, 'D') 
respectively returned a number with the call stack position (from the 
bottom of the stack i.e. the last stack element would have position 1) 
and an userdatum which can be used with debug.getinfo (and other debug.* 
functions) to retrieve the stack data in O(1) rather than O(n) time (as 
long as the stack position remains valid).

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