- Add ncurses patch 20160806
+ improve CF_GNU_SOURCE configure macro to optionally define
_DEFAULT_SOURCE work around a nuisance in recent glibc releases.
+ move the terminfo-specific parts of tput's "reset" function into
the shared reset_cmd.c, making the two forms of reset use the same
strings.
+ split-out the terminal initialization functions from tset as
progs/reset_cmd.c, as part of changes to merge the reset-feature
with tput.

- Add ncurses patch 20160730
+ change tset's initialization to allow it to get settings from the
standard input as well as /dev/tty, to be more effective when
output or error are redirected.
+ improve discussion of history and portability for tset/reset/tput
manual pages.
- Add ncurses patch 20160723
+ improve error message from tset/reset when both stderr/stdout are
redirected to a file or pipe.
+ improve organization of curs_attr.3x, curs_color.3x
- Add ncurses patch 20160709
+ work around Debian's antique/unmaintained version of mawk when
building link_test.
+ improve test/list_keys.c, showing ncurses's convention of modifiers
for special keys, based on xterm.