4401. [misc] Change LICENSE to MPL 2.0.
update copyright notice
3396. [bug] OPT records were incorrectly removed from signed, truncated responses. [RT #31439]
2534. [func] Check NAPTR records regular expressions and replacement strings to ensure they are syntaxically valid and consistant. [RT #18168]
1973. [func] TSIG HMACSHA1, HMACSHA224, HMACSHA256, HMACSHA384 and HMACSHA512 support. [RT #13606]