Add and use _readaccountconf_mutable_default and
_saveaccountconf_mutable_default helpers to capture
common default value handling.
New approach also eliminates need for separate
underscore-prefixed version of each conf var.
Add and use _readaccountconf_mutable_default and
_saveaccountconf_mutable_default helpers to capture
common default value handling.
New approach also eliminates need for separate
underscore-prefixed version of each conf var.