+20180331
+ + improve terminfo write/read by modifying the fourth item of the
+ extended header to denote the number of valid strings in the extended
+ string table (prompted by a comment in unibilium's sources).
+
+20180324
+ + amend Scaled256() macro in test/picsmap.c to cover the full range
+ 0..1000 (report by Roger Pau Monne).
+ + add some checks in tracemunch for undefined variables.
+