+20200118
+ + expanded description of XM in user_caps.5
+ + improve xm example for xterm+x11mouse, xterm+sm+1006 -TD
+ + add history section to curs_slk.3x and curs_terminfo.3x manpages.
+ + update alacritty entries for 0.4.0 (prompted by patch by
+ Christian Durr) -TD
+ + correct spelling errors found with codespell.
+ + fix for test/configure, from xterm #352.
+
+20200111
+ + improve configure macros which check for the X11/Intrinsic.h header,
+ to accommodate recent MacOS changes.
+ + suppress gcc's -Winline warning; it has not been useful for some time
+ + update config.guess, config.sub
+
+20200104
+ + modify a couple of macros in aclocal.m4 to allow autoconf 2.69 to
+ "work", to help illustrate discussion in
+ https://invisible-island.net/autoconf/my-autoconf.html
+ + fix some warnings from autoheader-252
+