Add a few new functions#64

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XStargate wants to merge 6 commits intopysmo:masterfrom

XStargate:master

Commits on Jul 28, 2016

Add xcorr_full_polarity function to support mccc without changing polarity
XStargate
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Commits on Jul 29, 2016

Commits on Apr 19, 2017

Fix the following two bugs about MCCC results shown in GUI:
XStargate
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Commits on Oct 28, 2019

Add the usage of new features in the README.md
XStargate
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