CTR: documentation + discussed on dev list
Remove $Id keyword from files in /*
Remove svn:keywords property on files in /*

Technically, it is based on merge of r1561368 from tomcat/tc7.0.x/trunk.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1561373 13f79535-47bb-0310-9956-ffa450edef68