fixed a bug for where parent traits were modified when giving birth, if traits were multidimensional.
Also modified get_inc with GraphSpace, which was resulting in a wrong behaviour when D \neq nothing ..

v3.2 , updated consistently the package so that mutations can, if mu[i] = ndmis(space[i]) happen on every component of the high dimensional space. This is done in a performant way that has been benmarked.

updates on possibilities for dispersal on graphs. It is now ok to set D = nothing, which triggers a new dispersal kernel where individuals exactly move to neighbours