testing findByUserId()

fix coverage

if manual setup is open, close it after successful connection, fix #331

Fix code checker

Caching accounds and folders

Adding documentation links

log why sending a new mail failed

fix a bunch of issues reported by Scrutinizer

Remove shading of date

also show '& others' when message had people in cc

fix send/reply button being disabled again after sending a message

use correct capitalization for 'Re:' prefix, prevent stacking

send mails by using ctrl+enter

Adding favorite inbox

Starting functional tests against a GMail account

highlight only one folder at a time