Profile-page, improvement: ability to select specific litter

[FredMark]

See also the improvement about being able to select a specific date-range,
this would be a very helpful improvement on top of that:

the option to choose what kind of litter you want to see (or not want to see).
So maybe show all kinds of litter in a column on the left side and something with '>>' and '>' to move all or one to the column on the right so you can say which litter you want to be part of the query.