- Some bugfixes made in Relation

- Fixed search() methods in EntityCollection
- Work done on Relations of EntityTrait ; a lot of work still to be done. It must also move to another file.

src/Repository.php

@@ -68,12 +68,12 @@ class Repository
         return Ulmus::runSelectQuery($this->queryBuilder, $this->adapter)->fetchColumn(0);
     }
 
-    public function deleteOne() 
+    protected function deleteOne() 
     {
         return $this->limit(1)->deleteSqlQuery()->runQuery();
     }
     
-    public function deleteAll() 
+    protected function deleteAll() 
     {    
         return $this->deleteSqlQuery()->runQuery();
     }