fn:transform - tidy up unit tests

Unit tests for fn:transform are mostly composed of convenient UT re-interpretations of the XQTS test suite. There are a lot, so collect them in a subdirectory.

Author: alanpaxton

exist-core/src/test/java/xquery/xquery3/XQuery3Tests.java

@@ -26,8 +26,9 @@
 
 @RunWith(XSuite.class)
 @XSuite.XSuiteFiles({
-        //"src/test/xquery/xquery3",
-        "src/test/xquery/xquery3/fnTransform87.xqm"
+        "src/test/xquery/xquery3",
+        "src/test/xquery/xquery3/transform",
+        //"src/test/xquery/xquery3/transform/fnTransform13a.xqm",
 })
 public class XQuery3Tests {
 }