Maxcube fix for issue #1599

Signed-off-by: Marcel Verpaalen <marcel@verpaalen.com>
Maxcube Support for manual mode setting

Signed-off-by: Marcel Verpaalen <marcel@verpaalen.com>
Improved the fix for issue #1599 based on comment @dominicdesu
Merge pull request #1767 from marcelrv/maxcube

[Maxcube] fix for #1599 - Do not set Thermostat to manual when changing Temperature