Update INSTALL.md
Update INSTALL.md

Solve some problems of dependencies, once replaced xapian with whoosh

joanma100/agora-ciudadana,pirata-cat/agora-ciudadana,joanma100/agora-ciudadana,joanma100/agora-ciudadana,MareAtlantica/agora-ciudadana,agoravoting/agora-ciudadana,agoravoting/agora-ciudadana,MareAtlantica/agora-ciudadana,joanma100/agora-ciudadana,MareAtlantica/agora-ciudadana,pirata-cat/agora-ciudadana,MareAtlantica/agora-ciudadana,agoravoting/agora-ciudadana,pirata-cat/agora-ciudadana