+20100109
+ + 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)
+