Fixed glitch in clipping for XYPlot tracks with negative values
remove stray console.log
fix plugin js loading bug
mitigate some race conditions during startup
refactor the NCList data store histograms to come from a
getRegionFeatureDensities method instead of store, and remove use of
this.refSeqs in favor of getting the ref seq from the requested region
update release notes, i think i've fixed steffi's latest bug
release 1.9.7
fixed a rare(?) initial-startup bug
Merge branch 'maint/1.9.x'

Conflicts:
	src/JBrowse/Browser.js
Merge branch 'master' into triplestore
make SPARQL backend support subfeatures