Full clean Maven build has been failing with PermGen out of space on my system for
a while. Memory analysis indicates that there are excessive javac
instances lying around, so create fresh ones each time to avoid this.

With this change, I no longer need bigger heap size.

Otherwise, eclipse gets unhappy with the @Override annotations.

This is based on watching another person building Jenkins for the first
time.

This reverts commit 604e7e07.

Revert "menu needs to be explicitly inherited"

This reverts commit 7add578b.

Revert "Push Maven site to another repository"

This reverts commit 71d8014b.