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Method
For WEIGHTED case uses method given in Weisskopf, Kahn, and
Sutherland (Ap.J. 199, L147 (1975)). This is corrected for
the extra statistical noise contribution at zero lag, and
can result in estimated ACF values > 1. The unweighted case
uses a similar method, omitting the weights.
UNBIASSED results are normalised by * 1 / (NPTS - LAG)
BIASSED results are normalised by * 1 / NPTS (suppressing large
lags).
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