[issue10273] Clean-up Unittest API

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

> people who are used to the current spelling 
> will have to notice the change, note that one 
> name is now deprecated

I haven't proposed any deprecations.
Just add the new names as aliases.
Change the docs list the new names
as primary and mention the old name for reference.

We don't have to sticking with crummy naming.

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