Updated mPDF tutorial materials#11

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benfrandsen wants to merge 4 commits intodiffpy:mainfrom

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Commits on Nov 22, 2016

updated mpdf tutorial with information about extracting ordered moment size
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Commits on Sep 29, 2017

updated mPDF tutorial materials
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Commits on Oct 27, 2017

updated fit numbers in some of the tutorial materials for mPDF
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Commits on Sep 18, 2018

Updated introTutorial to use the SrFit infrastructure for the example fit
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