fix offset min values, candidate orientation, and searchETs
reformat and add descriptions
fix regression in path merge (caught b/c we are stricter about readid contents)
simplify from feedback; add scoring example
improve RayScores.toString
improve examples to show different-length candidates and why we must do all-vs-all comparison
raise my hand against the deluge of error messages from graphbuild when filename is incorrect
reminder about checking to stop before pruning
improve graphviz output (show kmer length and #reads)
simplify and correct offset queries
minLength is based on toScore kmer not walkId
fix ReadHeadInfo shift values; add test cases again!
Merge branch 'wbiesing/ray-works-on-partially-merged-graph' into anbangx/test-cutoff-coverage