Rebuilding parser using javacc 4.1 loses Node import

JavaCC 4.2 loses the "org.apache.velocity.runtime.parser.node.Node" import for JJTParserState.java when rebuilding the parser.

Adding nodepackage="org.apache.velocity.runtime.parser.node" to the jjtree ant task in the build script will add the following import automatically which is better than no import or manually adding the import later:

import org.apache.velocity.runtime.parser.*;