added check that HOME Environmental Var exists before fixing permissions there
fixed bug in setup.py
add test for is-this-linux? in system_settings()
add _sys.xafsGroup and _xafs.set_xafsGroup() as default group for outputs of XAFS functions
convert all xafs functions to use set_xafsGroup so that the output group has a default of 'last group used for outputs by an XAFS function'
correctly calling pre_edge() without return vals
typo passing _larch reference to set_xafsGroup()