many small changes, mainly migrate to f-strings
check pylint and cleanup old code
arrange for the standard utils.py
changed utils -> iutils
removed some obsolete code
improved unittest
improved apidoc, unitest, pylint
improvements to meet pylint
make lines 27 more readable
minor change improve docstrings
fixed function docstring
some minor changes to cleanup ToDo
some minor improvements
change to meet pycodestyle
minor change
initioal commit