Revert autojoin_opers patch

It causes interesting desyncs of account names when run for more than 2
weeks

Revert "channel: refactor fe3c1c828eea7aa67da00627750c8b4312d2ecd0 and fix surrounding indentation"

This reverts commit 27b08207de7dc8b90c22c6d6aa37e93b39c57138.

Revert "src/channel: Fix for autojoin_opers segfault"

This reverts commit 8e1c8b75436d82a9e2a71d765c816fdbf9eb22fc.
Remove autojoin_opers

It was broken by the away-notify patch and fixing it is more work than
the feature is useful.
modules/m_whois: Allow clients to see their own umodes when whoising themselves
Bump up SSL cert generation strength