Merged batch find API from master

h2/src/main/org/h2/index/BaseIndex.java

@@ -5,8 +5,6 @@
  */
 package org.h2.index;
 
-import java.util.Collection;
-import java.util.Iterator;
 import java.util.List;
 import java.util.concurrent.Future;
 import org.h2.api.ErrorCode;

h2/src/main/org/h2/index/Index.java

@@ -5,7 +5,6 @@
  */
 package org.h2.index;
 
-import java.util.Collection;
 import java.util.List;
 import java.util.concurrent.Future;
 import org.h2.engine.Session;

h2/src/main/org/h2/index/MultiVersionIndex.java

@@ -6,8 +6,6 @@
 package org.h2.index;
 
 import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Iterator;
 import java.util.List;
 import java.util.concurrent.Future;
 import org.h2.api.ErrorCode;