Changes

Cleanup ant files, intro: build-common.xml used for all targets; Extracting build-junit.xml

Added FIXME comment: DBLBUFOFFSCRN, to tag the impl of forcing single buffer on offscreen/pbuffer

Fix missing MacOsX Newt refactoring

Attach build-junit.xml to build.xml ; Add more tests Offscreen(broken on ATI), Drawable

junit: Add timeout (30s), enable offscreen test

Fix NEWT Window destroy/close race condition,

where a programatic window.destroy() call from thread 1
triggers a destroy() call via the native windowing toolkit
via windowDestroyNotify().
It has to be checked/locked if a destroy is in progress,
otherwise they could deadlock (OSX and Win32).

*** Now Using Apache-Ant-1.8.0 ***

Cleanup:
    - Adding Javac includeAntRuntime argument (false whenever possible)

    - Clear junit results folder before testing

    - <ant ..> tasks, use inheritRefs="true" inheritAll="true" whenever possible
      for better performance and consistency (no duplicate property names).
      The JOGL build -> build-<component> tree is clean in this respect.

junit.run: Test*NEWT*
    Emulation of junit task,
    due to the fact that we have to place invoke our MainThread class first (-> MacOSX).
    Utilizing Ant-1.8.0 and ant-contrib-1.0b3 (loops, mutable properties).

    Fixed NEWT tests:
        - No more println .. using Assertions ..
        - Offscreen produces 2 files correctly (Linux/NVidia, OSX/NVidia, Win32/Emulation)

ant 1.8.0 on win32

Fix: Use file.seperator (win32); Use java.home/bin/java