Remove support for abandoned Totem distro.
Totem cleanup.
Remove support for abandoned Spark distro.
Remove support for abandoned Managing News distro.
Update docs.
Remove support for abandoned Open Atrium 6.x distro.
OpenScholar 3.16.0
PHP: Remove support for 5.5 built-in Zend OPcache - fixes #438
Make _STRONG_PASSWORDS length configurable per instance: 8-128, YES (32), NO (8)
PHP build could be broken also with MariaDB newer than 5.5.40 - fixes #452
Update CHANGELOG.txt
Update upgrade e-mail template.
Fix the contrib sync in Open Atrium.
Clean up duplicate line.
Sync with stable.
Improve backboa description and how-to.