+20211002
+ + use return-value from vsnprintf to reallocate as needed to allow for
+ buffers larger than the screen size (report by "_RuRo_").
+ + modify tset "-q" option to refrain from modifying terminal modes, to
+ match the documentation.
+ + add section on margins to terminfo.5, adapted from X/Open Curses.
+ + make tput/tset warning messages consistently using alias names when
+ those are used, rather than the underlying program's name.
+ + improve tput usage message for aliases such as clear, by eliminating
+ tput-specific portions.
+ + add a check in toe to ensure that a "termcap file" is text rather
+ than binary.
+ + further build-fixes for OpenBSD 6.9, whose header files differ from
+ the other BSDs.
+