Change the use of tuples, so that we use std::tuple when available.

Fix bug in calculation of initial guess in the incomplete gamma inverse.
Fix illegal comment in inverse_gamma.hpp source file.
Update docs to reflect tuple changes.
Regenerate docs.
Add Jamfile for the tools directory and make sure everything still builds cleanly.

[SVN r65320]

tools/beta_data.cpp

@@ -6,10 +6,8 @@
 #include <boost/math/bindings/rr.hpp>
 #include <boost/math/special_functions/gamma.hpp>
 #include <boost/math/constants/constants.hpp>
-#include <boost/math/tools/test.hpp>
-#include <fstream>
-
 #include <boost/math/tools/test_data.hpp>
+#include <fstream>
 
 using namespace boost::math::tools;