L=1 fix1 (typo)
L=1 Data

Also needed to add dense_diagonalize, because arpack won't diagonalize
2x2 matrices, even with 1 arnoldi vector.
Improved plot maker, nc correlation files

I made an error where the correlation length was coming out complex
because I forgot the abs in abs(lambda 1/ lambda2). However, I can back
out the number it should have been without rerunning.
L=2 data run again, same up to machine precision

Maybe I should chop off 1e-16 size numbers and imaginary parts?
Trying to fix Spectrum Plot to use nc, Weird MKL Error

MKL ERROR: Parameter 5 was incorrect on entry to ZGEEV

WAT