Minimap2

Minimap2 is used at run time in 4 crates (of which 1 optionally).

Depender (with downloads and own rev deps)			Minimap2 version
1.6K	1	mm2		^0.1.20
		asts		^0.1.20
		ullar		^0.1.17
		scrubby	optional	^0.1.20