Allowing paths in use_module(library(..)) (#604)

In a module, the path is restricted in being an atom.

src/lib/tabling/table_data_structure.pl

@@ -15,8 +15,8 @@
 	    get_nb_identifiers/3                % +Table, -NbWorklistID, -NbAnswerTreeID
 	  ]).
 
-:- use_module(table_link_manager).
-:- use_module(trie).
+:- use_module(library('tabling/table_link_manager')).
+:- use_module(library('tabling/trie')).
 
 /*  Part of SWI-Prolog
 
@@ -53,7 +53,7 @@
     POSSIBILITY OF SUCH DAMAGE.
 */
 
-:- use_module(batched_worklist).
+:- use_module(library('tabling/batched_worklist')).
 
 :- use_module(library(atts)).
 :- use_module(library(gensym)).