SGTools: Report an error for recursive reads.
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3@@ -44,7 +44,8 @@ class DataStore;
@@ -339,7 +340,7 @@ class DataStore;
@@ -348,7 +349,7 @@ class DataStore;
Have DataProxy::accessData return an error if it's called recursively for the same object. Should help in diagnosing errors that would otherwise cause an infinite recursion.