Remove DataMatrix file, not needed

src/main/java/no/nibio/vips/model/daydegreemodel/DataMatrix.java

-/*
- * Copyright (c) 2016 NIBIO <http://www.nibio.no/>. 
- * 
- * This file is part of PsilaRosaeTempModel.
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package no.nibio.vips.model.daydegreemodel;
-
-import no.nibio.vips.util.DateMap;
-
-/**
- * @copyright 2016 <a href="http://www.nibio.no/">NIBIO</a>
- * @author Tor-Einar Skog <tor-einar.skog@nibio.no>
- */
-public class DataMatrix extends DateMap{
-    public final static String TMD = "TMD";
-    public final static String TMD0C = "TMD0C";
-}
-