R/qtlcharts version 0.9-6

[Karl Broman]

A new version of R/qtlcharts (for interactive graphics) is available on CRAN; see also http://kbroman.org/qtlcharts

Major changes (see https://github.com/kbroman/qtlcharts/blob/master/NEWS.md):

• Updated to use D3 version 4
• Add new tool for exploring pleiotropy for two traits, ipleiotropy()
• All charts now can take a caption within chartOpts which will show up as text below the figure. This is intended for stand-alone html files.
• iplotScanone now includes a quantitative scale for x-axis in the case of a single chromosome
• In iplotScanone and iplotScantwo, in phenotype × genotype plots when switching between markers on the same chromosome, we animate the movement of points
• Fixed X chromosome case in iplotScantwo so only relevant two-locus genotypes are shown

karl