get_grooves_rollapply: Using rollapply to find grooves in a crosscut
In CSAFE-ISU/bulletr: Algorithms for Matching Bullet Lands

Using rollapply to find grooves in a crosscut

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get_grooves_rollapply(bullet, smoothfactor = 15, adjust = 10,
  groove_cutoff = 400, mean_left = NULL, mean_right = NULL,
  mean_window = 100, second_smooth = T, which_fun = mean)

`bullet`	data frame with topological data in x-y-z format
`smoothfactor`	The smoothing window to use
`adjust`	positive number to adjust the grooves
`groove_cutoff`	The index at which a groove cannot exist past
`mean_left`	If provided, the location of the average left groove
`mean_right`	If provided, the location of the average right groove
`mean_window`	The window around the means to use
`second_smooth`	Whether or not to smooth a second time
`which_fun`	Which function to use in the rollapply statement