improve error message
add statistics to stitcher
add statistics to needleman-wunsch, plus make it (slightly) prefer inserts
deal with lower case field names in gff3, silence some debugging
make method to detect if MeanVarianceEstimator is in a valid state (ie, has seen data)
add dino compilation
don't attempt to snip reads to shorter than they are, leave them alone in that case
allow a GeneAnnotationReader to be carried with a ReferenceGenome