[Notice] The tip of 'next' will be rewound shortly

As has become customery recently, the 'next' branch will be rewound to
base on the last released 'master', since the v1.6.1 release was cut.

Also, earlier parts of nd/narrow topic has been dropped from 'next' and
the topic has been kicked back to 'pu'.  I haven't started looking at
moving any topics out of 'pu' to 'next' yet, so there is nothing new on
'next', other than the things that came from 'master' and 'maint'.