msvc 6 compiler bug, uint32_t >> 32 leaves value unchanged. Minimal
rule sets with no rules but special rules failed. Removed obsolete comment.
X-SVN-Rev: 7149
outputs '0' rather than nothing. Clone uses getRules() UnicodeString directly,
previously was extracting to (unterminated!) UChar*. Dispose NULLs out
fields of deleted objects to prevent double delete.
X-SVN-Rev: 7109