[FIX] modules: temporaty fix to allow installing hidden/technical modules
[FIX] modules: temporaty fix to allow installing hidden/technical modules

A better way to hide technical modules and a better thought
classification for Apps/Extra/Technical modules should still
be done before releasing 6.1
MarkusTeufelberger/openobject-server,vnc-biz/openerp-server,gisce/openobject-server,ovnicraft/openerp-server,MarkusTeufelberger/openobject-server,splbio/openobject-server,gisce/openobject-server,ovnicraft/openerp-server,MarkusTeufelberger/openobject-server,splbio/openobject-server,gisce/openobject-server,vnc-biz/openerp-server,splbio/openobject-server