ref: ee75e2999b66bd9f258a241c487b6677cf2fa071
parent: 15b64d51da48807c5f896f17b33d8c0d054c9461
author: Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>
date: Sat Mar 25 12:09:56 EDT 2017
Remove the now superflous defaultExtension And some other unsed fields and methods.