Bug 9634: Allow for combining same paraneters in SQL reports

Bug 9634: Allow for combining same paraneters in SQL reports

This patch combines report paramters with the same name and data type
(authorised value)

This presereves the past ability to provide all parameters as
'sql_params' in order to preserve existing public report links

To test:
 1 - Create a report that takes multiple parameters, e.g.:
SELECT <<cat>> AS one, <<dog|branches>> AS two, <<dog|YES_NO>> as three,
       <<cat>> as four, <<dog|branches>> as five
 2 - Run this report, note you are asked for five parameters
 3 - Apply patch
 4 - Update database
 5 - Run report, note you are asked for three params
 6 - Verify the results reflect the supplied parameters
 7 - Export the report and verify results
 8 - Alter the URL and provide 5 params as sql_params and no param_name
 variables i.e.
 http://localhost:8081/cgi-bin/koha/reports/guided_reports.pl?reports=1&phase=Run+this+report&sql_params=Banana&sql_params=CPL&sql_params=0&sql_params=Orange&sql_params=LPL
 9 - Verify results come out as expected. i.e. 5 different values that
       are those of the URL.

Signed-off-by: Victor Grousset <victor.grousset@biblibre.com>
Signed-off-by: Charles Farmer <charles.farmer@inLibro.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>