[pymvpa] tiny suggestion for SOM (10 second change)

[Ike Hall]

It would appear that the SimpleSOMMapper class performs the initialization
of it's Kohonen layer in the SimpleSOMMapper._train method.  As the
.train() method calls ._pretrain, ._train, and ._posttrain in order, I
submit that it would be preferable to move the initialization phase to
._pretrain.  With this change, if one wants to subclass the SimpleSOMMapper
to use some other initialization, they only need to override ._pretrain
rather than _train.

--Ike Hall
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