Switch hsm to using fftw for fourier transform
(#340)
Turn off TMV debugging in hsm
(#340)
Apply mask at the start so don't have so many if statements
(#340)
Use matrix multiplication to determine moments
(#340)
In find_ellipmom_1, only loop through pixels with good rho2, so we can remove the if statement
(#340)
Faster convolution, but makes precomputed regauss values fail.  Need to ask Rachel to look at this.
(#340)