Attempt at fixing markdup memory issues #179
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This should fix the issues with nf-core/rnaseq on some weird samples where markDuplicates always consumes more memory than it should be using and thus gets consistently killed on various cluster environments. We had similar issues in Sarek at some point and I took the same approach over here to hopefully fix these matters now: SciLifeLab/Sarek#689
We're testing locally atm, but I already wanted to give people some heads-up that I'm on it.