When FraSCAti is run with Maven then use the 'target' directory as Juliac output directory.
  Else create a new temp directory deleted when the JVM will exit.
* Added the 'MAVEN-TARGET-DIRECTORY' SCA property to the Juliac component.
* Removed '/target' from the value of both GEN-DIRECTORY and CLASS-DIRECTORY properties.
* Removed static for the field GEN_DIRECTORY.