rearranged ceus directories for system

stable-crust/grid/ceus-stable/mfd-map.json

stable-crust/grid/ceus-stable/source-tree.json

...le-crust/grid/ceus-stable/sscn/gk/adaptive/rate-tree.json

...crust/grid/ceus-stable/sscn/gk/adaptive/rupture-sets.json

stable-crust/grid/ceus-stable/sscn/gk/fixed/rate-tree.json

...le-crust/grid/ceus-stable/sscn/gk/fixed/rupture-sets.json

stable-crust/grid/ceus-stable/sscn/gk/source-tree.json

...le-crust/grid/ceus-stable/sscn/nn/adaptive/rate-tree.json

...crust/grid/ceus-stable/sscn/nn/adaptive/rupture-sets.json

stable-crust/grid/ceus-stable/sscn/nn/fixed/rate-tree.json

...le-crust/grid/ceus-stable/sscn/nn/fixed/rupture-sets.json

stable-crust/grid/ceus-stable/sscn/nn/source-tree.json

...e-crust/grid/ceus-stable/sscn/r85/adaptive/rate-tree.json

...rust/grid/ceus-stable/sscn/r85/adaptive/rupture-sets.json

stable-crust/grid/ceus-stable/sscn/r85/fixed/rate-tree.json

...e-crust/grid/ceus-stable/sscn/r85/fixed/rupture-sets.json

stable-crust/grid/ceus-stable/sscn/r85/source-tree.json

stable-crust/grid/ceus-stable/sscn/source-tree.json

stable-crust/grid/ceus-stable/tree-info.json

...le-crust/grid/ceus-stable/usgs/gk/adaptive/rate-tree.json