print_qtlchart_resources -> print_qtlcharts_resources
print_qtlcharts_resources: make onefile=TRUE the default

  - Also, I'd forgotten to commit the change to NAMESPACE
Don't strip white space in chartOpts
iplotCorr: default is now empty title
iplotMap and iboxplot: default is now empty title
I forgot to commit the changes to the man pages
iplotMap: accept a cross object, in which case use pull.map if necessary
Add vignette describing use with R Markdown