Duplicate atoms in AtomIndex to reproduce old GroundingSpace behavior

Author: vsbogd

lib/src/atom/matcher.rs

@@ -970,10 +970,15 @@ impl BindingsSet {
         BindingsSet(smallvec::smallvec![])
     }
 
-    /// Creates a new unconstrained BindingsSet
+    /// Creates a new BindingsSet with a single full match
     pub fn single() -> Self {
         BindingsSet(smallvec::smallvec![Bindings::new()])
     }
+    
+    /// Creates a new BindingsSet with `count` full matches
+    pub fn count(count: usize) -> Self {
+        BindingsSet(smallvec::SmallVec::from_elem(Bindings::new(), count))
+    }
 
     /// Returns `true` if a BindingsSet contains no Bindings Objects (fully constrained)
     ///