Revert [67111] (addition of boost/detail/iomanip.hpp) and all the commits that depend on it. ([68137], [68140], [68141], [68154], and [68165]).

[SVN r68168]

example/geometric_examples.cpp

@@ -48,12 +48,11 @@ and we need some std library iostream, of course.
   // for negative_binomial_distribution
   using boost::math::normal; // typedef provides default type is double.
 
-#include <ios>
 #include <iostream>
   using std::cout; using std::endl;
   using std::noshowpoint; using std::fixed; using std::right; using std::left;
-#include <boost/detail/iomanip.hpp>
-  using boost::detail::setprecision; using boost::detail::setw; 
+#include <iomanip>
+  using std::setprecision; using std::setw; 
 
 #include <limits>
   using std::numeric_limits;