DNS views, part 21 (4 of 6)

Issue #26
Program: dnsdelip

This commit provides:
- second argument (view) to dnsdelip
- small bugfix in dnsdelhost call to dbabort
- use del-ip library procedure
- bug fix in del-ip library procedure (calls
    to writelog)
- translation of messages and comments
- reduce size of dnsdelhost by removing the
    obsolete local del-ip function
- syntax-error no longer quits (call "d error" method
    instead)
DNS views, part 21 (5 of 6)

Issue #26
Program: dnsmodattr

This commit provides:
- second argument (view) to dnsmodattr
- add check-mac library procedure
- use check-mac in www/cgi/mod as well
- translation of messages and comments
- syntax-error no longer quits (call "d error" method
    instead)