Changes

AWT/GL Printing WIP: Abstract AWT tile painting code out to AWTTilePainter, reused w/ GLCanvas and GLJPanel

Complete commit 54dcdf1f53c9fc1f7124cf77bbf5aa952d42053a, exposing GL2ES3 in GLProfile (just a query, no new profile)

Fix TileRenderer*: Allow general usage w/ any GL profile, only image-buffer requires >= GL2ES3; Always set pack-alignment, Set glReadBuffer(..) >= GL2ES3

- Allow general usage w/ any GL profile, only image-buffer requires >= GL2ES3
  Due to GL2ES3.GL_PACK_ROW_LENGTH and image-width != tile-width

- Always set pack-alignment
  Forgot for tile-buffer

- Set glReadBuffer(..) >= GL2ES3
  Required if using FBO offscreen, i.e. MSAA mode.

TileRenderer*: Fix FBO MSAA use-case, i.e. call swapBuffers() before endTile(); Enhance unit tests for MSAA, also add TileRendererBase.TileRendererNotify to GearsES2

GL[Auto]Drawable.swapBuffers() must be called before endTile().

This is especially important if using multisampling offscreen FBO drawables,
where swapBuffers() triggers the <i>downsampling</i> to the readable sampling sink.

Otherwise, we will be 'one tile behind' !

TiledPrintingAWTBase: Fix scaling - Fit frame to page, add MSAA RenderingHints test; setupPrint(Graphics2D): Query RenderingHints to use MSAA rendering

- AWTPrintLifecycle.setupPrint(Graphics2D): Query RenderingHints to use MSAA rendering
  - Impl. in GLCanvas
  - TODO GLJPanel (would need a new offscreen buffer)

- TiledPrintingAWTBase:
  - Fix scaling - Fit frame to page
  - add MSAA RenderingHints test

- GLCanvas: Remove dumpStack() DEBUG output

Test: Don't resize frame, tweek print-matrix; AWTPrintLifecycle: Add scale and convenient AWT container traversal context; GLCanvas/GLJPanel properly handle existing MSAA and req. AA;

- Test: Don't resize frame, tweek print-matrix
  - Use scaleComp72 to scale the frame to fit on page,
    i.e. global print matrix

  - Use scaleGLMatXY = 72.0 / glDPI
    to locally scale on the GL drawable as being passed to AWTPrintLifecycle.setup(..)

  - Hence frame stays untouched/stable, no need for 'offscreen' print test,
    which is removed.

- AWTPrintLifecycle: Add scale and convenient AWT container traversal context
  Use a simple decoration for all AWTPrintLifecycle impl. components within a container:

    final AWTPrintLifecycle.Context ctx = AWTPrintLifecycle.Context.setupPrint(frame, g2d, scaleGLMatXY, scaleGLMatXY);
    try {
    } finally {
       ctx.releasePrint();
    }

- GLCanvas/GLJPanel properly handle existing MSAA and req. AA;
  - GLCanvas: Workaround bug where onscreen MSAA cannot switch to offscreen FBO,
              i.e. stay 'onscreen'
  - GLJPanel: Use new offscreen FBO if MSAA is requested and not yet used.

- GLJPanel.Offscreen.postGL(): always swapBufer(), was missing for !GLSL swapping

Results GLCanvas / GLJPanel:
  - Good scaling
  - Stable behavior / visibility
  - High DPI mode works

doc/Implementation/AWTPrinting: Update to match latest code

Aggregate and cleanup '.ps' and '.pdf' artifacts (printing tests)