[patch]: Fix tests/tutorial/matlab_iter_example.cpp

[Jules Bergmann]

Adds a test_write function to create the sample.mat file necessary for 
the read tests.

There is a race between this and the other tutorial/matlab test if 
they're run in parallel.  Fortunately, the release testing is serial (sigh).

Patch applied.

-- 
Jules Bergmann
CodeSourcery
jules at codesourcery.com
(650) 331-3385 x705
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