This one is now set at __init__

viewer are no longer plugins.
Improved significantly the ergonomy of the periodictable viewer
The user can now performs several atom selection and transmutation.
Improved the atom list widget
Fixed several bugs
Added new icons

Bug fix that was making the sphinx-build very slow

warnings with sphinx

Bug fix related to pickle mechanism and User definitions

Bug fix in UD_STORE

Many bug fixes related to ud

Slight change in atom selection selectors name

Bug fix in FloatConfigurator
Added unit tests
Any error is now caught at the Job level when running a job
Removed unused imports

Removed unused IConfigurator.add_dependency method
Bad import in PlotterPlugin

Fused Configurable and ConfiguratorsDict classes
Improved the docstring of configurators-based classes

reintroduced now