Added account to local contacts

app/src/main/java/eu/faircode/email/TupleContactEx.java

@@ -0,0 +1,15 @@
+package eu.faircode.email;
+
+public class TupleContactEx extends EntityContact {
+    public String accountName;
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof TupleContactEx) {
+            TupleContactEx other = (TupleContactEx) obj;
+            return (super.equals(obj) &&
+                    accountName.equals(other.accountName));
+        } else
+            return false;
+    }
+}