before this fix, the installation could not complete because
invoiceninja checks if an env-file exists. if it does, it complains
and setup wont finish. this fix comments the code for this check.
* add check_process file
* change nginx conf to allow install in root-path and subdomain
* remove public-option
* use php version variable
* remove useless tasks in various install scripts
* remove service removal step
* run upgrade steps with sudo
* fix upgrading
* fix dbpwd variable and restore script
* seed db on first install
* use correct upgrade procedure