Cleanup commented out code

While I was at it, remove unnecessary licensing info from top

model-dmdocument/src/main/java/gov/nasa/pds/model/plugin/AbstractGenerationPlugin.java

@@ -1,33 +1,3 @@
-// Copyright 2019, California Institute of Technology ("Caltech").
-// U.S. Government sponsorship acknowledged.
-//
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are met:
-//
-// * Redistributions of source code must retain the above copyright notice,
-// this list of conditions and the following disclaimer.
-// * Redistributions must reproduce the above copyright notice, this list of
-// conditions and the following disclaimer in the documentation and/or other
-// materials provided with the distribution.
-// * Neither the name of Caltech nor its operating division, the Jet Propulsion
-// Laboratory, nor the names of its contributors may be used to endorse or
-// promote products derived from this software without specific prior written
-// permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
-// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-// POSSIBILITY OF SUCH DAMAGE.
-
 package gov.nasa.pds.model.plugin;
 
 import java.io.File;
@@ -63,7 +33,6 @@ public void execute() throws MojoExecutionException {
       getLog().info("Writing artifacts from those sources to ‘" + this.target + "’");
       File d = new File(this.target);
       d.mkdirs();
-      // DMDocument.outputDirPath = d.toString() + "/";
       this.generateArtifacts();
     } catch (RuntimeException ex) {
       throw ex;