Show length (length computing was fixed in sql function)

git-svn-id: https://dev.camptocamp.org/svn/c2corg@5719 5b3c568a-86f9-4a59-a47a-7be284f604b4
camp banner D + BD revolt

git-svn-id: https://dev.camptocamp.org/svn/c2corg@5720 5b3c568a-86f9-4a59-a47a-7be284f604b4
ensure that web/uploads/images_temp will be correctly created when calling c2corg --install
Merge branch 'master' into master-fixes-migration
remove useless comments