Added option to let percentage and counts display relative to parent element

[Shians]

(In reference to #75)

• Added argument percentMode = c("total", "parent") to allow percentages and counts to be shown relative to the parent element rather than of the total.
  • Breadcrumb will always show percentage relative to the total
  • Default argument value is "total", so results of existing function calls should be unchanged

I'm not totally sure of the argument name, since it toggles both percent and count modes, but having a separate percentMode and countMode feels a bit clunky. Maybe can even incorporate this into the JS to toggle within the widget.

sequences <- read.csv(
  system.file("examples/visit-sequences.csv",package="sunburstR")
  ,header = FALSE
  ,stringsAsFactors = FALSE
)[1:100,]

Displaying total percentage:

sunburst(
  sequences
  ,count = TRUE
)

Displaying percentage of parent:

sunburst(
  sequences
  ,count = TRUE
  ,percentMode = "parent"
)

[timelyportfolio]

@Shians thanks so much for the pull!!!! I am not sure how I missed it until now. I will review and submit feedback over the next couple of days.

[PrMortimer]

@Shians thanks so much for the pull!!!! I am not sure how I missed it until now. I will review and submit feedback over the next couple of days.

Hi! Any advancement on the reviewal/submission process so far ? Thanks !