Provide a complete implementation of the vMAT_MATv5ReadOperationDelegate protocol (even though we are intentionally short-circuiting it).
Fix test cases so they close their streams… and then make the vMAT_StreamDelegate not crash when they do.
NSParameterAssert(stream != nil) in vMAT_StreamDelegate's designated initializer.
Delete unused code from -readToplevelElement method.
Initial check-in of vMAT_load; can't really load anything yet, but handles degenerate case of reading a .mat file without loading any variables.