Progress meter for long running ops

[stelmo]

Sampling takes long, I would like to know how long I need to wait... Something like https://github.com/timholy/ProgressMeter.jl would be nice...

[exaexa]

Let's generalize a bit, this is also useful when planning a coffee pause during a FVA or screening. :D

[exaexa]

looking at it, this would probably require a pmap() version that supports the progress reporting