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fashion. Aliases are not meant to be used as keywords, which may be misleading
when looking at FigTestWithAliases in figures_tests.py

I modified FigTestAxesAliases: now the alias y_range becomes y_range_alias
so that the keyword y_range is not overwritten by the alias and does not
gain priority.

as well as filtering out unknown keywords.

Now priority is:
1. specific keyword
2. aliases
3. axes keywords

Also added the tests for the priority and for the aliases

Now the keyword aliases is treated differently. MyFig.update does not
replace the aliases but updates it. To allow the user to gives arguments
without caring of keep track of the former aliases.

to overwrite the attribute aliases completely the user now need to do:

fig.aliases = replacement

instead of

fig.update(aliases=replacement)

This is meant to prevent the user from overseeing a typo in the functions names

Added infrastructure for testsuites for myAxes and myFig

myAxes Test suite started
myFig  Test suite not started