+ modify configure macro CF_XOPEN_SOURCE, etc., to use CF_ADD_CFLAGS
consistently to add new -D's while removing duplicates.
+ modify a few configure macros to consistently put new options
before older in the list.
+ add tiparm(), based on review of X/Open Curses Issue 7.
+ minor documentation cleanup.
+ update config.guess, config.sub from
http://savannah.gnu.org/projects/config
(caveat - its maintainer put 2010 copyright date on files dated 2009)
