Major update: obiarrays with columns containing indices referring to

character strings.

src/obidms.h

@@ -72,6 +72,8 @@ int obi_dms_exists(const char* dms_name);
  * if a directory with this name does not already exist
  * before creating the new database.
  *
+ * A directory to store obiarrays is also created.
+ *
  * @param dms_name A pointer to a C string containing the name of the database.
  *                 The actual directory name used to store the DMS will be
  *                 `<dms_name>.obidms`.