+20200314
+ + add history note to curs_scanw.3x for <stdarg.h> and <varargs.h>
+ + add history note to curs_printw.3x for <stdarg.h> and <varargs.h>
+ + add portability note to ncurses.3x regarding <stdarg.h>
+
+20200308
+ + update copyright notices in test-packages.
+ + modify tracemunch to guard against errors in its known_p1 table.
+ + add several --with-xxx-libname options, to help with pkgsrc (prompted
+ by discussion with Thomas Klausner).
+
+20200301
+ + modify wbkgd() and wbkgrnd() to avoid storing a null in the
+ background character, because it may be used in cases where the
+ corresponding 0x80 is not treated as a null (report by Marc Rechte,
+ cf: 20181208).
+