+- Added welcome message when nmh detects that its version changed.
+- Fewer lseek(2)s will be used when reading headers in the common case.
+- Single-character headers can be reliably formatted, etc., instead of
+ apparently being missing.
+- ./configure's --enable-debug has been removed; it did nothing.
+- configure now defaults to enabling each of TLS and Cyrus SASL if the
+ necessary headers and libraries are found.
+- Moved build_nmh to top-level directory.
+- Better error reporting for connections to network services