4401. [misc] Change LICENSE to MPL 2.0.
update copyright notice
2534. [func] Check NAPTR records regular expressions and replacement strings to ensure they are syntaxically valid and consistant. [RT #18168]
1763. [func] Perform sanity checks on NS records which refer to 'in zone' names. [RT #13002]
1402. [cleanup] A6 has been moved to experimental and is no longer fully supported. developer: jinmei reviewer: marka
update tests for MD and MF know longer being loadable
copyright update
avoid the file name extension '.orig' so as not to conflict with 'patch'