Bug 11735 - Use new DataTables include in calendar template

Bug 11735 - Use new DataTables include in calendar template

Bug 10649 introduced a new include file for adding DataTables-related
JavaScript assets. This patch adds use of this include file to the
calendar template and corrects some table sorting configuration errors.

To test you should have multiple calendar entries in various categories
of holiday: Unique holidays, repeating yearly holidays, repeating weekly
holidays, and exceptions. Sorting of date columns should work regardless
of your dateformat system preference.

Signed-off-by: merlissia <manuelimel@gmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Note: Day of week is not correctly sorted: Sundays, Mondays, Thursdays.
But it is not a regression. It is caused by the ugly way to display
weekdays (document.write).

Signed-off-by: Galen Charlton <gmc@esilibrary.com>