Update GFA reader to support GFA v1.2 paths #117

Job	Run time
🚧 Build SPAdes	4m 25s
Single-cell E.coli deeptrench	1m 52s
Single-cell E.coli JGI lane 7	3m 42s
Single-cell+contigs E.coli UCSD lane 1	9m 43s
Single-cell E.coli JGI lane 7 2 libraries	6m 3s
Single-cell M.ruber JGI lane 9	9m 5s
Single-cell P.heparinus JGI lane 7	10m 19s
Single-cell P.marinus	7m 8s
Single-cell+PacBio TM6	7m 34s
Single-cell single-end P.marinus	5m 2s
	1h 4m 53s

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