Removed Jakarta Commons Lang. It is not used. Don't know why I once thought Commons...

Removed Jakarta Commons Lang. It is not used. Don't know why I once thought Commons IO depends on Commons Lang. Shrug.
Upgrade for Apache Xerces-J from 2.2.1 to 2.7.1.
Upgrade for Apache Xalan-J from 2.4.1 to 2.7.0 (notice the new serializer.jar which was separated out from xalan.jar because xercesImpl.jar now needs this functionality because of the latest JAXP)
Upgrade for XML Commons Externals (xml-apis.jar). This is version 1.3.02 which is bundled with both Xerces-J 2.7.1 and Xalan-J 2.7.0)
Upgrade for Apache Batik to 1.6 ("all-jar" built using JDK 1.3.1_15 from the source distribution)
Upgrade for Apache Avalon Framework from 4.1.4 to 4.2.0.
Added a README.txt which documents all dependencies and should serve as primary for licensing information on FOP dependencies.
Adjusted fop.bat to the changed JAR names.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@231295 13f79535-47bb-0310-9956-ffa450edef68