ALL: Move all test classes in a different source package: test

src/test/SearchIterator.java → test/adql/SearchIterator.java

-package test;
+package adql;
 
 /*
  * This file is part of ADQLLibrary.

src/test/SearchResult.java → test/adql/SearchResult.java

-package test;
+package adql;
 
 /*
  * This file is part of ADQLLibrary.

src/test/TestADQLQuery.java → test/adql/TestADQLQuery.java

-package test;
+package adql;
 
 import java.util.Iterator;
 

src/test/TestIN.java → test/adql/TestIN.java

-package test;
+package adql;
 
 import java.util.Iterator;