bug 5127: sample notice templates for suggestions

bug 5127: sample notice templates for suggestions

* supply default suggestion status change email
  templates.
* remove the deprecated mail_suggestion_*.tmpl files

There are a couple suggestion statuses referred to
in the code and suggestion management page that currently
do not have notice templates defined: ASK and CHECKED.  These
seem to be internal, so perhaps default message templates
are not needed for these.

Signed-off-by: Galen Charlton <gmcharlt@gmail.com>