Comment 8 for bug 160196

Added a wrapper for zope.app.server.zpasswd which is installed in bin/zpasswd of new grokprojects.

This script just generates ZCML snippets with principal definitions for inclusion in site.zcml or any other ZCML file. Users have to put the output in the appropriate ZCML file themselves, but they can use the tool with nearly any setup they have (separate users.zcml, additional/other password managers, ...).

Because the tool is generated by a simple entry in `buildout.cfg`, it is also easy to get rid of it in projects, if the tool is not wanted.

A document concerning changing the login credentials on grok.zope.org should also be provided.