Convert WOTest class to use Objective-C 2.0 properties

Convert WOTest class to use Objective-C 2.0 properties

This commit converts most of the accessors for the instance variables in the
WOTest class to Objective-C 2.0 properties.

At the same time some unused instance variables were disposed of or marked for
future deprecation.

Note that due to an apparent bug in the compiler I was unable to implement the
public-readonly/private-readwrite pattern as suggested in the documentation,
and so the readonly/readwrite portions are commented out. I will be making a
reduced test case for this and filing a Radar. Watch for a future commit that
adds the Radar number in a comment.

Signed-off-by: Wincent Colaiuta <win@wincent.com>