Add module `gprinter`, methods `undual`, `g_invol`, `ccon`, `sp`, `no… #116

Job	Run time
Python 3.8	4m 54s
Python 3.9	4m 59s
Python 3.10	5m 26s
Python 3.11	5m 55s
Create release and send to PyPI	0s
	21m 14s

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