updated the technical documentation.

src/musredit_qt5/mupp/mupp.dox

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+/*********************************************************************************************
+
+  name:       mupp.dox
+
+  created by: Andreas Suter, 2020/05/19
+
+  content:    Description of mupp
+
+**********************************************************************************************/
+
+/**
+
+\mainpage mupp - muon parameter plotter
+
+<p>mupp allows to quickly plot parameters found in db-/dat-files. db-/dat-files are typically generated by msr2data from msr-files after fitting. A db-/dat-file is a collection of fitting parameters from a collection of muSR measurements. For instance a db-/dat-file collects a full temperature scan, a field scan, an energy scan, etc.
+
+mupp allows to load these collections, select parameters in a x/y fashion and allows to plot it. It furthermore allows to create new variables which are mathematical transformations of the parameter vectors of a collection.
+
+*/