[facet] create a RangeRQLPathFacet (closes #2852512) This facet is a mix between a RQLPathFacet and a RangeFacet, allowing to use the FacetRangeWidget on the RQLPathFacet target attribute

if repo.system_source.dbdriver == 'postgres':
    sql('ALTER TABLE appears ADD COLUMN weight float')
    sql('UPDATE appears SET weight=1.0 ')