-JH/18 Convert macro handling to be tree-based, from the previous linear list.
- With the number of builtin macros we now have this is worthwhile,
- dropping the config-file read time (during which new macros are checked
- and registered, and macros are expanded) from about 500 usec to about 180.
+JH/18 Bug 2239: Enforce non-usability of control=utf8_downconvert in the mail
+ ACL. Previously, a crash would result.
+
+JH/19 Speed up macro lookups during configuration file read, by skipping non-
+ macro text after a replacement (previously it was only once per line) and
+ by skipping builtin macros when searching for an uppercase lead character.
+
+JH/20 DANE support moved from Experimental to mainline. The Makefile control
+ for the build is renamed.