Move all expand/e0xx files to expand/erxx to avoid namespace issues to toRdf/e0xx which come from expand/00xx.

Author: gkellogg

tests/expand-manifest.jsonld

@@ -1,4 +1,4 @@
 {
-  "@context": "e002-in.jsonld",
+  "@context": "er02-in.jsonld",
   "@id": "http://example/test#example"
 }

tests/expand/e046-in.jsonld renamed to tests/expand/0124-in.jsonld

@@ -1,4 +1,4 @@
 {
-  "@context": "e003-in.jsonld",
+  "@context": "er03-in.jsonld",
   "@id": "http://example/test#example"
 }

tests/expand/e046-out.jsonld renamed to tests/expand/0124-out.jsonld

@@ -1,4 +1,4 @@
 [{
-  "@context": "e005-in.jsonld",
+  "@context": "er05-in.jsonld",
   "@id": "http://example/test#example"
 }]

tests/expand/e047-in.jsonld renamed to tests/expand/0125-in.jsonld

@@ -771,7 +771,7 @@
     }, {
       "@id": "#te001",
       "@type": ["jld:PositiveEvaluationTest", "jld:ToRDFTest"],
-      "name": "drop free-floating nodes",
+      "name": "drop free-floating nodes (xxx drop, duplicates #te046)",
       "purpose": "Free-floating nodes do not generate RDF triples (from expand-0001)",
       "input": "toRdf/e001-in.jsonld",
       "expect": "toRdf/e001-out.nq"