Bug 12052: New syspref to display message on the OPAC patron summary page

Bug 12052: New syspref to display message on the OPAC patron summary page

Test plan:

Fill the OPACMySummaryNote with HTML code or just text.
The content should be displayed at the OPAC on the summary page for
patrons.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Work as described. No koha-qa errors

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works as described, passes tests and QA script.
Rephrased the pref text a little bit, using 'logged in' instead of
'connected', also added " so the description appears correctly in the
pref editor.

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