USFFT Mat class

[Dmitry Karpeev]

I'm writing a new Seq matrix class called USFFT that effects the FFT of
unevenly-spaced functions.
USFFT is roughly, an extension of the SeqFFTW class.
While looking at the FFTW Mat class with Satish we noticed that
MatCreate_SeqFFTW
is not being registered in MatRegisterAll. In light of this, there are two
question:
1) Is that a problem?
2) Should I register the constructor for the new class (MatCreate_SeqUSFFT)?

Thanks.
Dmitry.
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