FreenetIS

Refs #1101: Support for Debian Stretch (PHP 7.0 + Maria DB 15.1). Improved setup that no longer support database creation (in Maria DB it is hard to do so from non-root user due to security restrictions), database setup error cause was added, disabling Settings DB queries in non-setup environment. In order to fix DB init some FK indexes/constrains must have been renamed in 1.1.0 SQL script (Maria DB enforces uniqueness on FK names).