Important comment was added to summation function.
	modified:   boost/math/special_functions/detail/hypergeometric_series.hpp
Check for bad q(i) has been added to 1f1.
	modified:   boost/math/special_functions/hypergeometric.hpp
Check for nonnegative parameters has been added to all functions.
	modified:   boost/math/special_functions/hypergeometric.hpp