Bug 9685: Allow sort baskets by number

Bug 9685: Allow sort baskets by number

In acqui/booksellers.pl, first column of baskets tables is "name (#number)".
This allows to sort by name but not by numnber.

This patch splits acutal first column into 2 columns number and name to
allow sorting on number.
Sets default sort on name like existing.

Test plan:
Look at page and use sorting on name and number columns.

Signed-off-by: Marc Sabin <marc.sabin@sciencespo-grenoble.fr>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Nice change for better usability.
Sorting of both columns works nicely.
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>