Import Upstream version 0.4.0~beta1

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diff --git a/src/de/lmu/ifi/dbs/elki/data/synthetic/bymodel/distribution/Distribution.java b/src/de/lmu/ifi/dbs/elki/data/synthetic/bymodel/distribution/Distribution.java
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+package de.lmu.ifi.dbs.elki.data.synthetic.bymodel.distribution;
+/*
+This file is part of ELKI:
+Environment for Developing KDD-Applications Supported by Index-Structures
+
+Copyright (C) 2011
+Ludwig-Maximilians-Universität München
+Lehr- und Forschungseinheit für Datenbanksysteme
+ELKI Development Team
+
+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 <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * Interface for a simple distribution generator
+ * with a PDF, i.e. it can also compute a density
+ * 
+ * @author Erich Schubert
+ */
+public interface Distribution {
+  /**
+   * Generate a new random value
+   * @return new generated value
+   */
+  public double generate();
+  /**
+   * Return the density of an existing value
+   * @param val existing value
+   * @return distribution density
+   */
+  public double explain(double val);
+  
+  /**
+   * Describe the generator
+   * @return description
+   */
+  @Override
+  public String toString();
+}