Quote-of-the-day (QOTD) Feature for OPAC

This feature will add the option of displaying a select quote
for the day on the OPAC homepage. It will include the addition
of a QOTD editor in the tools section of the staff interface
which will allow the addition, editing, and deletion of quotes.
A single system preference will enable/disable the display of
the QOTD on the OPAC homepage. A new granular permission will
also be added to conrol user access to the QOTD editor tool.

Possible extentions to this would be code to allow alternate
quote selection algorithms to be added to vary how the currently
displayed quote is selected from the table of quotes.

This patch is a squash of the following work:

--Adding quotes table to kohastructure.sql and updatedatabase.pl

Note: This patch is intended for a MySQL based installation only.
That means that it includes backticks because that is what is required
at this point in history to install Koha correctly on a MySQL based
installation.

Feel free to port this over to the Pg stuff in the data/Pg directory.

--Adding system preference to control display of QOTD on OPAC main page
--Adding sample quote data

These quotes are taken from various US presidents. I'm not sure these
are applicable to the rest of the world, so I'm leaving it to translators
and others to add sample quote data for other languages.

--Adding edit_quotes user permissions
--Squash with other db related patches in this series
--Adding quotes editor pages to tools
--Adding QOTD editor link to tools homepage
--Integration of DataTables into QOTD Editor
--Impleminting jEditable into the quote editor
--Adding delete and add option to editor
--Fixing OPAC display so the QOTD div does not show if no quote is returned
--Also removing useless code from tools/quotes.pl
--Adding spans around QOTD foo in opac-main.tt
--Also fixing quote selection logic to accomodate the possibility of
    a single quote in the db a litte better.
--Changing timestamp column header to a more user-friendly 'Last Displayed'
--Fixing bug in quote selection logic. This bug caused a situation where
    when the table had only a single quote with an id greater than 1 in it,
    no quote would be selected.
--Fixing up sorting in the quote editor table. --jcamins
--Adding span element to quote separator --jcamins
--Overriding the default empty table message supplied by datatables-strings.inc
--Adds missing page heading
--Adds beginning of click-for-help elements.
--Refactors delete functionality to allow selecting of quotes to delete,
    enabling multi-delete.
--Refactors saving added quote functionality so that striking <Enter>
    saves the new quote.
--Refactors canceling aded quote functionality so that striking <Esc>
    cancels the new quote.
--Removing debug console.log statements
--Implementng the YUI button widget/toolbar used on other pages.
--Adds a 5px radius to all YUI buttons to bring them into
    conformity with the general trend toward rounded corners
--Fixes capitalization in quote editor
--Implements improvements suggested by jcamins and oleonard
--Adds DataTables Plugin dataTables.fnReloadAjax.js
QOTD uploader to enable uploading csv files containing quotes

This series will add a DataTable's based upload/editor with which
to upload csv files containing quotes to be used by the QOTD
feature.

The file should be formatted thusly:

"source","text-of-quote"
"source","text-of-quote"
...

Note: This work serves as a good example of potential improvements
in all other "editor" and file upload areas of Koha.

This patch is a squash of the following work:

--Adding code to parse CSV file contents and push it into a DataTable
--Adding in jEditable to enable table editing
--Adding ajax to post data back to the server to be saved
--Fixing edit and adding delete functionality
--Adding some missing css as well as server feedback on save
--Fixing a bug which limited the number of quotes which could be uploaded
--Also fixing a minor bug with fnCSVToArray and doing some style cleanup.
--Adding sanity checks to verify file type and size
--Implements YUI button widget/toolbar
--Improved handling of hiding uploader UI
--Adds row selectability
--Adds multi-delete capability
--Adds YUI button/toolbar widget
--Fixing capitalization in quote uploader
--Implements improvments suggested by jcamins and oleonard