fix typo for dataview in xrfdisplay
Revert "fix typo for dataview in xrfdisplay"

This reverts commit dc677b13483b40947b08f0b06a6a3e571a2856da.
fix typo for dataview import
fix fitting example to use correct interp() syntax
fix bug with some uses of star args in function calls
added fledgling 'parse group args for 1st arg Group'
cleaned up from overzealous commit of junk
cleaned up from overzealous commit of junk
cleaned up from overzealous commit of junk
cleaned up from overzealous commit of junk
better support for first argument group
support for first argument group in XAFS functions
fixes to required/recommeded modules in setup.py
change default label from xmu to mu
change default label from xmu to mu
core library fixes for python3 compat
plugin fixes for python3 compat
remove docutils as a requirement
add color error messages, if termcolor module is available
improve python3 compatibility of wx-code