Trad: Add constante MAIN_CORE_ERROR if "$dolibarr_main_prod" is defined, better error message with an ajax dialog

New: add constante MAIN_CORE_ERROR if "$dolibarr_main_prod" is defined, better error message with an ajax dialog

New: A lot of enhancements into ECM module. Dir can contains special characters. Speed enhancements. Dir can be created outside of dolibarr, the refresh button will update database.

New: A lot of enhancements into ECM module. Dir can contains special characters. Speed enhancements. Dir can be created outside of dolibarr, the refresh button will update database.