Database schema internationalization, step 7

Translate database schema (table and column names)
into English.

Step 7:
- translate column names in pgauth.user table:
    lastname (old: nom)
    firstname (old: prenom)
    mail (old: mel)
    phone (old: tel)
    addr (old: adr)
    phlast (old: phnom)
    phfirst (old: phprenom)
- rework ::webapp::authbase class and attribute
    map, such as attributes are in english
- rework pgauth subsystem in order to use these
    attribute names
- propagate these new attributes names in tabuid()
    array used through Netmagis
- translate some %...% holes and CGI form parameters

phew !