Add docs, fix Makefile and fix some bugs and typos

dbutils.c

@@ -30,3 +30,29 @@ establishDBConnection(const char *conninfo, const bool exit_on_error)
 
 	return conn;
 }
+
+
+
+bool
+is_standby(PGconn *conn)
+{
+    PGresult   *res;
+	bool		result;
+
+    res = PQexec(conn, "SELECT pg_is_in_recovery()");
+    if (PQresultStatus(res) != PGRES_TUPLES_OK)
+    {
+        fprintf(stderr, "Can't query server mode: %s", PQerrorMessage(conn));
+        PQclear(res);
+        PQfinish(conn);
+		exit(1);
+    }
+
+	if (strcmp(PQgetvalue(res, 0, 0), "f") == 0)
+		result = false;
+	else
+		result = true;	
+
+	PQclear(res);
+	return result;
+}