Whichlang

Whichlang is used at run time in 4 crates (of which 2 optionally).

Depender (with downloads and own rev deps)			Whichlang version
16K	12	lingua	optional	^0.1.1
6.9K	2	bm25	optional	^0.1.1
200		trprvr		^0.1.1
		dawnsearch		^0.1.0