Fix simplification of non-quantized inputs.
Fix simplification of non-quantized inputs.

The simplify routine was assuming that arcs were in delta-encoding, which is not
true for non-quantized topologies.

koshlan/topojson,lyhpcha/topojson,whoinlee/topojson,hcxiong/topojson,youprofit/topojson,ststeiger/topojson,tsl3su/WorldMap_Choropleth,mbostock/topojson,maxogden/topojson,btahir/topojson,studiowangfei/topojson,ongerit/topojson,AlpinHologramm/topojson