- added dependency to frascati-implementation-fractal
  - compiled the FraSCAti composite containing FraSCAti FScript
  - added FraSCAti.composite and FScript.composite
  - added an empty frontend class FraSCAtiFScript.java
  - made client interfaces optional in .fractal
  - updated test cases to bootstrap with FraSCAtiFractal
* Cosmetic updates of pom.xml