added sudo to the list

not all setups have it and the miab installer depends on it
Merge pull request #275 from grepwood/master

add `apt-get install sudo`
simplify some output in the work-in-progress mail log scanner
nginx: explicitly listen on both ipv4 and ipv6 (works even if ipv6 isn't present)
add a 'redirects' feature in web/custom.yaml
for .fund domains use RSASHA256 DNSSEC keys
explain how to install a multi-domain or wildcard ssl cert; if one is installed, the Replace Cert button in the admin for non-primary domains should not replace the cert on the primary domain
indicate in the admin when a multi-domain or wildcard certificate is in use
Fixed a small status check bug, where secondary dns server check fails misleadingly.
Merge pull request #282 from m4rcs/master

Fix NS status check - should sort on both ends of the comparison
bump ownCloud to 7.0.4; fixes #283