[Kst-plot/kst] d13dfc: Add cross spectra to pykst

[Barth Netterfield]

  Branch: refs/heads/master
  Home:   https://github.com/Kst-plot/kst
  Commit: d13dfc7c9eb4053d1e69ddeaea706df2aac15eb2
      https://github.com/Kst-plot/kst/commit/d13dfc7c9eb4053d1e69ddeaea706df2aac15eb2
  Author: Barth Netterfield <netterfield at astro.utoronto.ca>
  Date:   2016-12-22 (Thu, 22 Dec 2016)

  Changed paths:
    M pyKst/demo/dataobjects.py
    M pyKst/pykst.py
    M src/libkstmath/basicplugin.cpp
    M src/libkstmath/dataobjectscriptinterface.cpp

  Log Message:
  -----------
  Add cross spectra to pykst