New: Ajout du "potentiel" des prospects

htdocs/comm/action/listevents.php

htdocs/comm/prospect/fiche.php

htdocs/comm/prospect/prospects.php

htdocs/langs/en_US/companies.lang

htdocs/langs/fr_FR/companies.lang

htdocs/lib/company.lib.php

htdocs/prospect.class.php

htdocs/societe.class.php

htdocs/societe/commerciaux.php

htdocs/translate.class.php

mysql/data/data.sql

mysql/migration/2.2.0-2.4.0.sql

mysql/tables/llx_c_prospectlevel.sql

mysql/tables/llx_societe.key.sql

mysql/tables/llx_societe.sql