- now there is a base XMLUI class. Frontends inherits from this class, and add their specific widgets/containers/behaviour
- wix: param.py has been removed, as the same behaviour has been reimplemented through XMLUI
- removed "misc" argument in XMLUI.__init__
- severals things are broken (gateway, directory search), following patches will fix them
- core: elements names in xml_tools.dataForm2XMLUI now use a construction with category_name/param_name to avoid name conflicts (could happen with 2 parameters of the same name in differents categories).
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