Cleaned up and inproved the code that integrates Groovy in the OFBiz framework:
* Groovy services and Groovy events now use the same util methods from GroovyUtil to parse/execute the scripts
* the script base class is now specified in the base/config/groovy.parameter file rather than in the serviceengine.xml
* the same util methods (DSL) are now available to all Groovy scripts (executed as services, events or widget actions)
* removed a series of unused methods in the GroovyUtil class



git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1636346 13f79535-47bb-0310-9956-ffa450edef68