code: public String getMdwVersion(File projectDir) throws IOException {
          File gradleProps = new File(projectDir + "/gradle.properties");
          if (!gradleProps.exists())
              throw new IOException("Missing: " + gradleProps.getAbsolutePath());
          Properties props = new Properties();
          props.load(new FileInputStream(gradleProps));
          return props.getProperty("mdwVersion");
      }
docs: This returns the CLIENT app MDW version (as opposed to the CLI version
  returned by run());
  TODO: Read mdw version from plugin.xml if present, and compare
  with gradle.properties.
  TODO: Support mdw version in pom.xml as alternative to gradle.properties.