Reintroducing the 'origin' field of a transaction. It is used by the …

…Replication extension only;

For now I'd like to restore it; I'd propose to mark it deprecated and find a better way ASAP. We can't throw it away right now :-(

src/org/exist/storage/txn/Txn.java

@@ -37,6 +37,7 @@ public enum State { STARTED, ABORTED, COMMITTED, CLOSED }
     private final TransactionManager tm;
     private final long id;
     private State state;
+    private String originId;
 
     private List<LockInfo> locksHeld = new ArrayList<>();
     private List<TxnListener> listeners = new ArrayList<>();
@@ -128,5 +129,26 @@ public void abort() {
     public void close() {
         tm.close(this);
     }
+
+    /**
+     * Get origin of transaction
+     * @return Id
+     */
+    @Deprecated
+    public String getOriginId() {
+        return originId;
+    }
+
+    /**
+     *  Set origin of transaction. Purpose is to be able to
+     * see the origin of the transaction.
+     *
+     * @param id  Identifier of origin, FQN or URI.
+     */
+    @Deprecated
+    public void setOriginId(String id) {
+        originId = id;
+    }
+
 }