updates mainly to support maven but also to support new ICommand wrapper for AjcTask:

updates mainly to support maven  but also to support new ICommand wrapper for AjcTask:
- findToolsJar now accepts versioned jars
- supporting a forkclasspath to permit user  to explicitly set
- upgrades for testing
  - so multiple iterations work,
    - not altering cmd in execute()
    - only fixing up outjar once
    - reset() complete
  - so incremental compile tests work,
    - passing quit through to main

- when forking on windows, use javaw rather than java
  if possible to avoid popping up a console window