We might consider some type of consolidation to define identical
concepts in one place - for example many items need a datatype
definition.  But, comparing to Error to Argument, for example, one
difference is that the Error item is optionally named but Arguments must
be named.

Installation of the local package for development testing has changed,
because calling setup.py directly is now deprecated (see multiple
sources in python community for more details)

Signed-off-by: Gunnar Andersson <gunnar.andersson@mercedes-benz.com>