Use unpack macro and pass rng

[Tortar]

Nice package @Devetak! I was taking a look at the code and I have compacted it a bit with the unpack macro and accepted a namedtuple which is less error prone, and, most importantly, setting the seed from inside a function is dangerous because you can end then have the default rng of julia to have that seed which can cause confusion e.g. before

julia> Mark0.mark0_noCB(Mark0.getParameters(), 10, 10, 1)
1-element Vector{Float64}:
 0.4996975599347817

julia> rand()
0.06236226260683142 # always the same