Updating from an old Domoticz version info

[waltervl]

When updating from an old version I think it would be useful to have an overview of the important changes that would influence your Domoticz install and need extra attention when you want to update and experience unexpected results. This overview can be found on the wiki:
https://wiki.domoticz.com/Releases#Chan ... _attention

The normal changes can of course still be found in the history.txt file on the repository or by clicking in Domoticz on the Domoticz version top left