Indexers are now cloned if needed to modify them after they've been

closed. Obligatory indexers' names now follow the same pattern as other
indexers (columnname_version). Closes #46 and #49.

src/obiblob_indexer.h

@@ -107,6 +107,24 @@ inline Obi_indexer_p obi_open_indexer(OBIDMS_p dms, const char* name)
 }
 
 
+/**
+ * @brief Clones an indexer.
+ *
+ * @param indexer The indexer to clone.
+ * @param name The name of the new indexer.
+ *
+ * @returns A pointer on the new indexer structure.
+ * @retval NULL if an error occurred.
+ *
+ * @since May 2016
+ * @author Celine Mercier (celine.mercier@metabarcoding.org)
+ */
+inline Obi_indexer_p obi_clone_indexer(Obi_indexer_p indexer, const char* name)
+{
+	return obi_clone_avl_group(indexer, name);
+}
+
+
 /**
  * @brief Closes an indexer.
  *