Fix util:index-keys() function.
Fix util:index-keys() function.

svn path=/trunk/eXist-1.0/; revision=1315

windauer/exist,jensopetersen/exist,RemiKoutcherawy/exist,hungerburg/exist,dizzzz/exist,adamretter/exist,lcahlander/exist,windauer/exist,kohsah/exist,kohsah/exist,eXist-db/exist,opax/exist,jessealama/exist,eXist-db/exist,joewiz/exist,lcahlander/exist,eXist-db/exist,olvidalo/exist,shabanovd/exist,MjAbuz/exist,olvidalo/exist,dizzzz/exist,hungerburg/exist,joewiz/exist,MjAbuz/exist,lcahlander/exist,opax/exist,wshager/exist,lcahlander/exist,joewiz/exist,jensopetersen/exist,zwobit/exist,adamretter/exist,dizzzz/exist,jessealama/exist,dizzzz/exist,MjAbuz/exist,adamretter/exist,joewiz/exist,ambs/exist,ljo/exist,zwobit/exist,windauer/exist,hungerburg/exist,jensopetersen/exist,zwobit/exist,jessealama/exist,ljo/exist,patczar/exist,wolfgangmm/exist,ambs/exist,kohsah/exist,shabanovd/exist,lcahlander/exist,jensopetersen/exist,kohsah/exist,opax/exist,ljo/exist,dizzzz/exist,eXist-db/exist,wolfgangmm/exist,jensopetersen/exist,ljo/exist,RemiKoutcherawy/exist,olvidalo/exist,RemiKoutcherawy/exist,MjAbuz/exist,lcahlander/exist,olvidalo/exist,ambs/exist,wshager/exist,eXist-db/exist,ljo/exist,adamretter/exist,windauer/exist,wshager/exist,windauer/exist,RemiKoutcherawy/exist,MjAbuz/exist,patczar/exist,ambs/exist,kohsah/exist,opax/exist,joewiz/exist,olvidalo/exist,shabanovd/exist,wshager/exist,wshager/exist,shabanovd/exist,jessealama/exist,patczar/exist,wolfgangmm/exist,patczar/exist,dizzzz/exist,kohsah/exist,patczar/exist,wshager/exist,jensopetersen/exist,wolfgangmm/exist,wolfgangmm/exist,zwobit/exist,adamretter/exist,eXist-db/exist,joewiz/exist,patczar/exist,RemiKoutcherawy/exist,jessealama/exist,MjAbuz/exist,hungerburg/exist,hungerburg/exist,ambs/exist,opax/exist,zwobit/exist,ambs/exist,jessealama/exist,wolfgangmm/exist,zwobit/exist,shabanovd/exist,ljo/exist,adamretter/exist,windauer/exist,RemiKoutcherawy/exist,shabanovd/exist