CONVERT: Complete the documentation of the new AXISORDER parameter.

Record the change from dd6ba66da70e2 in the release notes.

Fixed some typos and adjusted to document style.

Post 2014A it's time to update a version number even though the
change might only justify a change to 1.7-2.  However, we've been
at 1.7 for a few releases.  Likewise increment SUN/55 date & version.