Added v2.2.22 ReleaseNotes and ChangeLog.

Added v2.2.21 ReleaseNotes and ChangeLog.

Add html versions of changelog and releasenotes.

Merge pull request ucb-bar#277 from ucb-bar/master

better error handling of misspelled config names

Update version comment.

Update commented version.

remove snapshot code

Fixed vcd dumping to occur after 'peeks'.

support CXXFLAGS

Fixed variable-length hashes for jackhammer dump files