[Dcmlib] Bug: Typo in gdcmFile::ProductVectorial

[Sean McInerney]

Hi All,

Attached is a patch for a typo in gdcmFile::ProductVectorial.

I am also attaching a second patch (hack) for addressing the lack of
powf() in some environments (notably Borland and Solaris, but probably
others). Would it not be simpler (better) to use double precision math
within the library as VTK has done recently? I cannot imagine single
precision math offering much advantage WRT performance or memory usage
(unless you are writing the results to a file).

-Sean
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