DaqAIn(): Make it hopefully less horrible.

Actually check the returned 'err'or status codes and abort on error,
instead of silent failure returning NaN's.
Retry data reception until a valid input report is received to make it
robust against race conditions.
Code cleanup and beautification.
Hopefully fixes some of the issues in forum message thread #15873.
Screen: Improved MSAA renderbuffer setup for depth+stencil on old hardware.

-> Screen for 32-Bit Matlab on OSX rebuilt and tested on old 10.5.8
system with GF 8800.
-> No rebuild for other platforms, we'll slip this into the next
official beta update.
Merge pull request #28 from Psychtoolbox-3/master

Resync with current master of official Psychtoolbox-3 repo.
Merge pull request #143 from kleinerm/master

PTB BETA RELEASE "Rainbows, Droids & Compute Hippies!" SP10

* Fix DaqAIn() which contained race-conditions.
* Fix MSAA rendering with imaging pipeline on old GPU's - for 32-Bit Matlab on OSX.