v15.1 Appliance Updates and Bugfixes - 70+ Rebuilt and Updated Apps

In the wake of the "mini-nightmare" (to quote a user) that was the Debian MariaDB auto removal fiasco; we're back with ~70 updated appliances (all the ones with MySQL/MariaDB). They include all the latest Debian packages. Additionally, those that also install 3rd party software, such as Redmine, Observium and WordPress (plus many more) also include the latest versions of that particular software.