+20200222
+ + expanded note in ncurses.3x regarding automatically-included headers
+ + improve vt50h and vt52 based on DECScope manual -TD
+ + add/use vt52+keypad and vt52-basic -TD
+ + check/workaround for line-too-long in Ada95 generate utility when
+ building out-of-tree.
+ + improve/update HEADER_DEPS in */Makefile.in
+ + add "check" rule to include/Makefile, to demonstrate that the headers
+ include all of the required headers for the types used.
+