makefile in packages directory

[DanGrayson]

There's something confusing about the makefile in the packages directory. I saw this behavior: a new package had no top level documentation node, and it was referred to in the file changes.m2, appearing in the html file as visibly undocumented.

Adding that documentation node to the package and typing "make" should have resulted in a proper link from the html form of the node in changes.m2 to the top node of the package.

Even better, all undocumented keys should have default html pages created for them, because there can be useful information on them that is automatically generated.