Fixed description of WSTOPSIG(), added WTERMSIG().  Problem reported by Jonathan Giddy <jon@dgs.monash.edu.au>.
Fixed description of WSTOPSIG(), added WTERMSIG().  Problem reported
by Jonathan Giddy <jon@dgs.monash.edu.au>.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator