[SciPy-dev] Added Matlab version 5.0 file reading support

[Travis Oliphant]

Thanks to the good start provided by Heinko, I have completed addition 
of read support for MATLAB(tm) version 5.0 mat files.  Sparse matrices 
are also read and converted to SciPy sparse matrices if you have 
compiled the sparse package (turned off by default).

The changes are in CVS and are part of the io.loadmat function (it now 
recognized v5 files).

Matlab(tm) Structures and objects are handled as (arrays of) dummy 
classes and are also supported.

Cell arrays are handled as an Object array.

-Travis O.