Converted to the gradle ecosystem

...ol/src/main/java/ca/nrc/cadc/ac/json/JsonGroupReader.java

...ol/src/main/java/ca/nrc/cadc/ac/json/JsonGroupWriter.java

...src/main/java/ca/nrc/cadc/ac/json/JsonUserListReader.java

...src/main/java/ca/nrc/cadc/ac/json/JsonUserListWriter.java

...rol/src/main/java/ca/nrc/cadc/ac/json/JsonUserReader.java

.../main/java/ca/nrc/cadc/ac/json/JsonUserRequestReader.java

.../main/java/ca/nrc/cadc/ac/json/JsonUserRequestWriter.java

...rol/src/main/java/ca/nrc/cadc/ac/json/JsonUserWriter.java

...rc/main/java/ca/nrc/cadc/ac/xml/AbstractReaderWriter.java

...rol/src/main/java/ca/nrc/cadc/ac/xml/GroupListReader.java

...rol/src/main/java/ca/nrc/cadc/ac/xml/GroupListWriter.java

...Control/src/main/java/ca/nrc/cadc/ac/xml/GroupReader.java

...Control/src/main/java/ca/nrc/cadc/ac/xml/GroupWriter.java

...trol/src/main/java/ca/nrc/cadc/ac/xml/UserListReader.java

...trol/src/main/java/ca/nrc/cadc/ac/xml/UserListWriter.java

...sControl/src/main/java/ca/nrc/cadc/ac/xml/UserReader.java

...l/src/main/java/ca/nrc/cadc/ac/xml/UserRequestReader.java

...l/src/main/java/ca/nrc/cadc/ac/xml/UserRequestWriter.java

...sControl/src/main/java/ca/nrc/cadc/ac/xml/UserWriter.java

...ntrol/src/test/java/ca/nrc/cadc/ac/GroupPropertyTest.java