Database schema internationalization, step 9

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

Step 9:
- translate the dns.rr_ip column addr (old: adr)
- translate all remaining "adr" to "addr" (CGI form
    parameters, %...% holes, variables, etc.)
- translate the dns.mail_role (old: dns.role_mail)
    table and columns mailaddr (old: idrr) and mboxhost
    (old: heberg)
- translate the dns.p_dom column mailrole (old: rolemail)
- translate the trr fields mailrole (old: rolemail) and
    mailaddr (old: adrmail) as well as associated
    functions (rr-xxx-by-view)