Introduce frugal mode #364

Job	Run time
🚧 Build SPAdes	1m 25s
Single-cell E.coli deeptrench	1m 46s
Single-cell E.coli JGI lane 7	3m 33s
Single-cell single-end P.marinus	4m 46s
Single-cell E.coli JGI lane 7 2 libraries	12m 58s
Single-cell+contigs E.coli UCSD lane 1	9m 4s
Single-cell P.heparinus JGI lane 7	7m 27s
Single-cell M.ruber JGI lane 9	8m 4s
Single-cell+PacBio TM6	7m 14s
Single-cell P.marinus	7m 13s
	1h 3m 30s

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