ANN - Towards a (Bio)Julia powered Genome Graphs framework

Thanks! Our GSoC student for this year Arda Akdemir, deserves most credit for tip clipping. I just merged and re-factored: the origonal GSoC design didn’t make use of the graph links and worked with just the kmers (unless I didn’t understand it!), I refactored and made use of the links info in the graph and made it fit as an iterative step in this GenomeGraphs dbg → tip_clipping / bubble_pop → K200 read pathing → “yet more scaffolding tm” workflow that’s intended.