Bug 15184: Prepare the ground - Move funds and sort fields autoupdate

Bug 15184: Prepare the ground - Move funds and sort fields autoupdate

We are going to reuse the same logic: when a fund is selected the
statistic values are automatically updated.
Let move it to make it reusable more easily and isolate the code.

Sponsored-by: BULAC - http://www.bulac.fr/
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>