Migration to Nextcloud 17.0.2 / PHP 7.3 - Done

Right now we are working on the upgrade to Nextcloud 17.0.2 and the switch to PHP 7.3. The progress can be followed here:

• Wait for the bugfix release 17.0.2 (done)
• Adjustment of the autoinstallation (done)
• New customers get Nextcloud 17 installed (done)
• Update all customers clouds to the last version of Nextcloud 17.0.1 (done)
• Test the migration of existing customers (done)
  
• Switch to PHP 7.3 (done)
• Eat your own Dogfood. Update of our own clouds (done)
  
• Migraition of all customers (done)