Added urlargs_replace_text_in_arg() that used to live in search_engine.py.  Refactored it a bit (e.g. do not use deprecated string module).
Added urlargs_replace_text_in_arg() that used to live in
search_engine.py.  Refactored it a bit (e.g. do not use deprecated
string module).

inveniosoftware/invenio,tiborsimko/invenio,tiborsimko/invenio,inveniosoftware/invenio