Replace source code: <package>/ __init__.py and version.py

[Tieqiong]

fix #22
fix #23
replace #46

[sbillinge]

@Tieqiong this looks good. It would be nice if we could get it to pass pre-commit.ci. @Sparks29032 and I fought with this yesterday for conf.py so we should be able to find a solution here too.

[Sparks29032]

@Tieqiong can you do a git diff and paste the result here? Once confirmed, seems good to merge!

[Tieqiong]

[Sparks29032]

@sbillinge There does not seem to be a PEP standard for newlines within triple quotes. The example given in the PEP specification has the triple quotes all in one line as @Tieqiong has currently, which is not done in diffpy.utils.

[sbillinge]

@sbillinge There does not seem to be a PEP standard for newlines within triple quotes. The example given in the PEP specification has the triple quotes all in one line as @Tieqiong has currently, which is not done in diffpy.utils.

I think I am ok with either way.