legacy: WebStat removal
legacy: WebStat removal

* INCOMPATIBLE Removes legacy WebStat module. (addresses #3233)

Signed-off-by: Esteban J. G. Gabancho <03cb568148df368b792a31d9c4d06b12dc802700@gmail.com>

inveniosoftware/invenio-access,tiborsimko/invenio-access,tiborsimko/invenio-access,inveniosoftware/invenio-access