cleanup

+cfg: readCfg() become global to go later to cfg class
+cfg: initGlobalDo accepts (bool)_force argument
+cfg: initGlobalDo returns False on error
+db: reset() accepts (bool)_force argument
+db: fetch() added to all engines tho not working in http yet, returning
False
+main: getDB accepts explicit (str)_folder argument
+command: 'reset cfg' removed, use 'transfer'
+command: cleaned up, not finished