final refactor of slab sources

subduction/slab/CA/source-group.json

 [
   {
-    "id": "merged"
+    "id": "single-branch"
   }
 ]

subduction/slab/OR/mfd-hi/rupture-sets.json

@@ -4,6 +4,6 @@
     "id": 8212,
     "feature": 8210,
     "mfd-tree": "or-wa-slab-mfd-hi",
-    "spatial-pdf": "pdf-or-mfd-hi.csv"
+    "spatial-pdf": "pdf-or.csv"
   }
 ]

subduction/slab/OR/mfd-lo/rupture-sets.json

@@ -4,6 +4,6 @@
     "id": 8211,
     "feature": 8210,
     "mfd-tree": "or-slab-mfd-lo",
-    "spatial-pdf": "pdf-or-mfd-lo.csv"
+    "spatial-pdf": "pdf-or.csv"
   }
 ]

subduction/slab/WA/mfd-hi/rupture-sets.json

@@ -4,6 +4,6 @@
     "id": 8222,
     "feature": 8220,
     "mfd-tree": "or-wa-slab-mfd-hi",
-    "spatial-pdf": "pdf-wa-mfd-hi.csv"
+    "spatial-pdf": "pdf-wa.csv"
   }
 ]

subduction/slab/WA/mfd-lo/rupture-sets.json

@@ -4,6 +4,6 @@
     "id": 8221,
     "feature": 8220,
     "mfd-tree": "wa-slab-mfd-lo",
-    "spatial-pdf": "pdf-wa-mfd-lo.csv"
+    "spatial-pdf": "pdf-wa.csv"
   }
 ]