small

- do not call goal expansion on meta-calls (that is done by undef).
- docs updates
- fix init code

packages/ProbLog/problog_learning.yap

@@ -730,8 +730,8 @@ update_query(QueryID,Symbol,What_To_Update) :-
 	  problog_flag(sigmoid_slope,Slope),
 	  problog_dir(PD),
 	  ((What_To_Update=all;query_is_similar(_,QueryID)) -> Method='g' ; Method='l'),
-	  atomic_concat([PD,
-			 '/problogbdd',
+      convert_filename_to_problog_path('problogbdd', ProblogBDD),
+	  atomic_concat([ProblogBDD,
 			 ' -i "', Probabilities_File, '"',
 			 ' -l "', Query_Directory,'/query_',QueryID, '"',
 			 ' -m ', Method,