BibDocFile: special characters escape
BibDocFile: special characters escape

* BETTER Escapes file name special characters including
  accents and spaces in document URLs.

Reviewed-by: Samuele Kaplun <2e218f779e12714c314fad8ebf6b3041daa21337@cern.ch>
Signed-off-by: Harris Tzovanakis <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@drjova.com>

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