"major item" in the form like
====================================
CLEHP 1.7.0.0 Distribution
====================================

I have inserted such markers for the recent ones as well.

These are useful in glancing at individual package changelongs,
to get a quick idea of when (that is, which release)various changes went in.

2) Created the first package ChangeLog, which is a "pruning" of ChangeLog
to reflect only matters relevant to the Random package.