Fix issue in func : DiagrammeMultiCirculaire

Fixed an issue when, if rows=1 or cols=1, the function will crash because ax (Axes of Subplot) wasn't interable

Complete Program!

Program/module completed with all functions and no issues (as of today).

Personalized TitleCell

Added support for personalized TitleCell as well as the docstring for it

Small fix (vanishing keys)

adding of a small fix that corrects a problem where keys were vanished after a listcomp to remove empty strings

Fix/improvement data merge with same key

Fix done! (cf. old issue)

DiagrammeCirculaire completed

The first version of DiagrammeCirculaire is completed and fonctionnal !

Support for one column of Data, with one column of keys, to be visualised and compared

I'm planning to work on the support of multiple columns of data to be used (cf. project)

DiagrammeBarres completed (fix)

Small fix of docstring and Readme

DiagrammeBarres completed

Added support for multiple columns of data to be used and visualised!

Will work on DiagrammeCirculaire soon

Beta Version (DiagrammeBarre only)

Première version, avec uniquement la fonction/méthode DiagrammeBarres fonctionelle et terminée