When previous panel was login, move to system_status

Reduce number of processes in the pool to 5

Fix small typo in comments

the logic in 4ed23f44 for taking backups more often was partly backward

This reverts commit b32cb622.

Fixes #627. Fixes #653. Closes #714.

Fix a typo in Readme

`matchs` → `matches`

Provisioning could crash if, e.g., the DNS we see is different from the DNS Let's Encrypt sees.

see #695, probably fixes it

Added a warning to the installation / setup script

See pull request #638 and issue #635 for more information.

before the user agrees to Let's Encrypt's ToS the admin could get a nightly email with weird interactive text

Made a mistake refactoring the headless variable earlier.

fixes #696

https://discourse.mailinabox.email/t/status-check-emails-empty-after-upgrading-to-v0-16/1082/3

A user on that thread suggests an alternate solution, adding `PYTHONIOENCODING=utf-8` to `/etc/environment`. Python docs say that affects stdin/out/err. But we also use these environment variables elsewhere to ensure that config files we read/write are opened with UTF8 too. Maybe all that can be simplified too.

Duplicity gives times in UTC. We were assuming times were in local time.

Fix: Correct IP is reported when using custom DNS

Fix bug that reports wrong ip, when custom DNS is enabled

tls control panel: only show integral seconds while waiting the requested time from Lets Encrypt, in case we got back a non-integral number of seconds to wait

bind postfix to the right network interface when sending outbound mail so that SPF checks on the receiving end will pass

fixes #3 (again)

fixed typo

Updated according to Josh's latest reaction. Sounds good.

Same result as maximal_queue_lifetime and bounce_queue_lifetime, but complies with rfc2821.

The default timeout for Postfix's maximal_queue_lifetime and bounce_queue_lifetime is 5 days. This is way too long if you expect someone to have an answer and after 5 days you'll get the message that it's not delivered. This disrupts communication. It would be more responsive if the user got the 'can't deliver' error after 24 hours.