Adds simples constants to `xoutil.datetime` for testing	weekdays
Algo simple en "mp.py".
Changes a probably confunsing name in the implementation of traverse.
Merge remote-tracking branch 'gitlab/develop' into develop
Fix some minor syntax problems with PEP-8
Some minor syntax changes.
Merge branch 'develop' of /media/manu/med-gnu/git/xoutil into develop
Protects againts None
Fixes bug in smart_copy when the default is a positional arg and is None.

According to the docstring, None could be the last positional argument for the
`defaults` and should behave just like passing False.
Ensures xoutil.types has a NoneType
Uses Sphinx RDT theme if available
Fixes docstring reference
Remove several unnecessary 'Unset' imports.
Removes repeated imports
New functions for reporting errors on exceptions.
* xoutil/cpystack.py: Modify tests for error info functions.
Adds a `walk_up` function to `xoutil.fs`.
Merge remote-tracking branch 'gitlab/develop' into develop
New functions to handle objects and methods documentations.
Merge remote-tracking branch 'merchise/develop' into develop