PTB BETA "The fun in dysfunction" SP-2

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This post-release update to "The fun in dysfunction" is dedicated to the
tragically deceased Aaron Swartz and others who fight for freedom of
information and for a free internet:

<https://www.eff.org/deeplinks/2013/01/farewell-aaron-swartz>
<http://www.zephoria.org/thoughts/archives/2013/01/13/aaron-swartz.html>
<http://sciencecitizen.org/?p=219>

This update contains some improvements to M-Files:

* Full high-level setup support for the panelfitter via
PsychImaging('AddTask', 'General', 'UsePanelFitter'): Selection of
common scaling/fitting modes. Fully compatible with all stereo display
modes, high-precision display modes and other PsychImaging tasks. Also
now fully compatible with RemapMouse().

* Cleanups to BeampositionTest by Ian Andolina.

* Robustness improvements to GStreamer-SDK detection on 64-Bit Windows.

* Fix PsychImaging display mirroring when only fixed-function pipeline
is active.

* Tiny fixes to moglmorpher() and LoadOBJFile().

* Minor tweaks to some demos.

Enjoy,
-mario