[ADMB Users] code to check for uninitialized variables

[dave fournier]

I modified the code in derch.cpp
so that it can be used for checking for unitilialized variables.

run this example with -dd 0  as in

    ./xx -dd 0

to check it out.  you use a stepsize of 0.0 to get this option
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DATA_SECTION
PARAMETER_SECTION
  init_vector x(1,5)
  number ssum
  objective_function_value f
PROCEDURE_SECTION
  ssum+=norm2(x-1.0);
  f=ssum;