Add indexer_language to change stemmer for xapian FTS indexer Nagy Gabor asked how to enable the hungarian stemmer in roundup. This required editing indexer_xapian.py replacing hardcoded "english" term. This value is now exposed in the config file under [main] index_language. This only works for xapian currently.

#!/usr/bin/env python
from __future__ import print_function
import zlib, base64, sys
print(base64.encodestring(zlib.compress(sys.stdin.read())))