This addresses an issue on the forums where the query to determine the
size of the `file_chunk` table is making the page load really slow for
people with large tables. This updates the query to improve the
performance of the page load time.

Also, add build version and path information for the PHAR files listed as
language packs.

This commit attempts to remove all coding standard warnings emitted by PHP
7.0.

This will help if the user has "Browser Preference" selected as the
preferred language. When email correspondence needs to be sent to the user,
the browser_lang extra attribute can be used as a backup to to the user's
language preference in the event that the language preference is set to auto
(Browser Preference).

Improve info display & formatting
Only show 8 chars of the last commit

Also, the final version of the system will not require the `gettext`
extension for PHP

Add information about current software versions, server software, php
extensions loaded, and database space usage.

In the future, this will offer a nice place to add an import/export button
for data backup and restore, announcements, and more