Popular Views blocktype

This is a block type written by Melissa Draper at Catalyst IT. We decided that 
it's not quite up to being included in the Mahara core, but I'm
sharing it on its own in case someone out there might find it useful.

See also:
https://bugs.launchpad.net/mahara/+bug/901894
https://reviews.mahara.org/#/c/964/

Copyright notice
----------------

Copyright (C) 2011 Catalyst IT and others; see:
https://wiki.mahara.org/index.php/Contributors

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, version 3 or later of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

Additional permission under GNU GPL version 3 section 7:

If you modify this program, or any covered work, by linking or
combining it with the OpenSSL project's OpenSSL library (or a
modified version of that library), containing parts covered by the
terms of the OpenSSL or SSLeay licenses, the Mahara copyright holders
grant you additional permission to convey the resulting work.
Corresponding Source for a non-source form of such a combination
shall include the source code for the parts of OpenSSL used as well
as that of the covered work.
