When setting up a brand-new server, a first_install_timestamp is now

recorded in settings, which can help with determining how long ago the

server was first installed.
On upgrade, a last_upgrade_timestamp is stored, showing when that

upgrade occurred.
These can be used to help determine the age of an install during

support diagnostic work.

Tested both installing and upgrading a database. Saw the

first_install_timestamp only for the new install, and the

last_upgrade_timestamp only when performing an actual upgrade.