match_num now loaded from database

and --keep-db deprecated in favour of --new-db (harder for me to fu*k up)

src/wani.py

@@ -125,8 +125,8 @@ if __name__ == '__main__':
 
     parser.add_argument('--db',
                         help="Database file to use (instead of memory)", default=None)
-    parser.add_argument('--keep-db',
-                        help="Does not recreate new database file", action='store_true')
+    parser.add_argument('--new-db',
+                        help="Writes over database file, if there exists one", action='store_true')
 
     parser.add_argument('--pc-tag',
                         help='Tag for separators, usually pc or c', default="pc")