Bas Brands authored Jan 11, 2019 and Michael Hawkins committed Mar 18, 2019

The Classic theme is being introduced as a Bootstrap 4 replacement
for the older themes based on Bootstrap 2, such as Bootstrapbase,
Clean and More. It is a child theme of Boost, with a navigation
structure similar to the Clean theme.

Co-authored-by: Bas Brands <bmbrands@gmail.com>
Co-authored-by: Michael Hawkins <michaelh@moodle.com>

This method removes all data in the database related to a
given conversation.

Add a tool for admins to test that the outgoing mail configuration is valid.