Add conjugate links during GFA I/O #115

Job	Run time
🚧 Build SPAdes	1m 33s
Multicell B.cereus TruSeq 100x	4m 13s
Contigs E.coli JGI lane 7	4m 4s
Full run M.ruber JGI lane 9	5m 57s
IonTorrent E.coli K12	30m 9s
Mate-pairs B.faecium	2m 2s
Nextera L.monocytogenes	4m 26s
PacBio M.ruber	4m 3s
Saves E.coli 100K	4m 38s
plasmidSPAdes C.callunae	7m 10s
Saves E.coli UCSD lane 1	13m 40s
Single-cell P.heparinus JGI lane 7	2m 50s
Single reads E.coli Deeptrench	1m 37s
metaSPAdes JGI 150	15m 56s
metaviralSPAdes ERR525599	14m 54s
	1h 57m 12s

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