+20171125
+ + modify MKlib_gen.sh to avoid tracing result from getstr/getnstr
+ before initialized.
+ + add "-a" aspect-ratio option to picsmap.
+ + add configure check for default path of rgb.txt, used in picsmap.
+ + modify _nc_write_entry() to truncate too-long filename (report by
+ Hosein Askari, Debian #882620).
+ + build-fix for ncurses-examples with NetBSD curses:
+ + it lacks the use_env() function.
+ + it lacks libpanel; a recent change used the wrong ifdef symbol.
+ + add a macro for is_linetouched() and adjust the function's return
+ value to make it possible for most applications to check for an
+ error-return (report by Midolikawa H).
+ + additional manpage cleanup.
+ + update config.guess, config.sub from
+ http://git.savannah.gnu.org/cgit/config.git
+