linux backport

file exists system predicate
$source_file -> $user source
hide and make system preds
fix check_head_and_body
user_expansion never fails
goal expansion is controlled b dynamic procedure
add must_be_of_type predicate_indicator
fix neat_call, debug flag is user controlled
use simplecudd, not ptoblogbdd
compile all of myddas
fx junk in file_name
fix warnings
use common file opening struct and funds
avoid pairs module
fix db queues

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'),
-      convert_filename_to_problog_path('problogbdd', ProblogBDD),
-	  atomic_concat([ProblogBDD,
+      convert_filename_to_problog_path('simplecudd', Simplecudd),
+	  atomic_concat([Simplecudd,
 			 ' -i "', Probabilities_File, '"',
 			 ' -l "', Query_Directory,'/query_',QueryID, '"',
 			 ' -m ', Method,