[logos] Overridable %subclass superclasses.

From: Dustin L. Howett <dustin@howett.net>

git-svn-id: http://svn.howett.net/svn/theos/trunk@620 4410221e-0ddf-4ce3-99c0-2db6c0dbc727
[logos] *Ref can be printed with %@ due to CFType. Heavy-handed assumption that *Ref is a CFType.

From: Dustin L. Howett <dustin@howett.net>

git-svn-id: http://svn.howett.net/svn/theos/trunk@621 4410221e-0ddf-4ce3-99c0-2db6c0dbc727
[logify] Only try to log return values from Logify if they're loggable.

From: Dustin L. Howett <dustin@howett.net>

git-svn-id: http://svn.howett.net/svn/theos/trunk@622 4410221e-0ddf-4ce3-99c0-2db6c0dbc727