src/input/exptest.input test worst case exponential values

Lefevre, et.al gave worst case input and output values for the
exponential function in IEEE-754r decimal64 format. This is a
test file for Axiom's exp function.
src/input/exptest.input test worst case exponential values

Lefevre, et.al gave worst case input and output values for the
exponential function in IEEE-754r decimal64 format. This is a
test file for Axiom's exp function.