[CppAD] New release cppad-20110101.5

[Brad Bell]

This release fixes some warnings using gcc 4.6.1.

There are still some warnings left in the cppad_ipopt_nlp library. These 
are due to the fact that certain typedefs are global and should be moved 
to a local space; see lines 610 through 616 of
     
https://projects.coin-or.org/CppAD/browser/trunk/cppad_ipopt/src/cppad_ipopt_nlp.hpp
where the typedefs for ADNumber, ADVector, SizeVector, and NumberVector 
occur. This file is not included by
     cppad/cppad.hpp
so it is not a problem in general. Fixing this problem may require a 
change to the cppad_ipopt_nlp API (and hence would not be put in the 
20110101.* releases).