Fixed issue #22

ros2rag.base/src/main/jastadd/backend/Generation.jadd

ros2rag.base/src/main/jastadd/backend/Mappings.jrag

ros2rag.tests/src/test/01-input/example/Test.relast

ros2rag.tests/src/test/01-input/example/Test.ros2rag

...t/java/org/jastadd/ros2rag/tests/DefaultOnlyReadTest.java

.../java/org/jastadd/ros2rag/tests/DefaultOnlyWriteTest.java

.../src/test/java/org/jastadd/ros2rag/tests/ExampleTest.java

.../test/java/org/jastadd/ros2rag/tests/Read1Write2Test.java

.../test/java/org/jastadd/ros2rag/tests/Read2Write1Test.java

...ts/src/test/java/org/jastadd/ros2rag/tests/TestUtils.java