Obey config file for no style
This is a bugfix release. Previously, if no style was passed into mepo, by default it chose prefix. This is fine for GEOSgcm, etc. but broke MAPL which uses naked.
For now, if no style is found passed in on the command line or in .mepoconfig
assume what is in components.yaml
is the correct sytle.
(Updates will be needed to fixtures to support all styles.)