Removed minmax.hpp from boost (leave Eric Niebler's former file)

and move it to subdir boost/algorithm/
Also incorporate boost::ref into boost/algorithm/minmax.hpp  to avoid
copy constructors when params passed by reference.


[SVN r23305]

libs/algorithm

@@ -1 +1 @@
-Subproject commit 6df2923b40ae6ecf58b4225cf1eac70c6259a613
+Subproject commit 729bb65a2dd19899b47065175663b9cbb2f9a476