Allow default attributes to be set via config and cmdline This commit changes the default attribute list from a fixed '*' to a configurable list, defaulting to ['*']. It allows one to use config file or command line to set default attributes to retrieve and display - i.e. to set default attributes to '+' or to a list of multiple specific attributes. Printing or changing this value through env/setenv is currently not supported because env/setenv only work properly with string values while attributes is a list.