#254 change viruses injected for several animals simultaneouslsy

sometimes there are optional viruses which get injected in several animals. clicking all of them one by one is very tedious. would it be possible to select several animals with the select button and select the viruses which were used for all of them simultaneously?

See issue #235.

ja die 'copy to' variante von ein tier ausgehend und dann einfach mehrere selecten können für die viren bspw. wäre dufte

Habe dort kurz mal beschrieben, was ich mir vorstelle :)