+20210508
+ + modify tputs' error check to allow it to be used without first
+ calling tgetent or setupterm, noting that terminfo initialization
+ is requires for supporting the terminfo delay feature (report by
+ Sebastiano Vigna).
+ + fix several warnings from clang --analyze
+ + add null-pointer check in comp_parse.c, when a "use=" clause refers
+ to a nonexisting terminal description (report/patch by Miroslav
+ Lichvar, cf: 20210227).
+