Picture for SelectAndCheckMass

At the time that the script is compiled we do not know which cradle
holds the desired mass. Therefore the picture file has to be a generic
picture of all 3 cradles. DEX generates the text to say which cradle is
the one to use.
Sequence files.

Implemented support for defining sequences of targets or of delays in
text files. The filename is parsed from the command line.
Script sets using sequence files.

A preliminary example of how to define the different scripts necessary
for the targeted profile. Includes examples of multiple blocks and
different size subjects.
Simulate supine position.

Made extensive changes to the MouseTracker module so that we will more
accurately simulate the supine position. The markers on the bar and box
are transformed according to what was the configuration when the
alignment was done and what is the configuration now. The manipulandum
markers are made to move next to the target bar, no matter what the
configuration.
Robust MatrixToQuaternion()

The algorithm to convert rotation matrices to quaternions was
ill-conditioned for 90° rotations. Here I have implemented a more
robust method.
Pictures

Added some NULL picture filenames to some places where it was missing.
Configuration specification from command line.

Cleaned up the system for specifying the hardware configuration
(upright or supine) and other parameters from the command line.