[mlpack] mlpack license confusion

[Josh Littlefield]

FYI: While the LICENSE.txt file was changed from LGPL to BSD-3C in Jan
2015, many (most?) of the source files still say they are licensed under
LGPL.  If the intent is BSD license, these headers should all be updated.

Josh Littlefield

-- 
Josh Littlefield                                  Cisco Systems, Inc.
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