bulletCheckCrossCut: Identifying a reliable cross section
In heike/x3prplus: Algorithms for Matching Bullet Lands

Should be changed: x should just indicate lower and upper limit. That is cleaner and should speed things up as well.

1 2	bulletCheckCrossCut(path, bullet = NULL, distance = 25, xlimits = c(50, 500), minccf = 0.9, span = 0.03, transpose = FALSE)

`path`	path to an x3p file
`bullet`	If passed in, the actual bullet already loaded
`distance`	positive numeric value indicating the distance between cross sections to use for a comparison
`xlimits`	vector of values between which to check for cross sections in a stable region
`minccf`	minimal value of cross correlation to indicate a stable region
`span`	The span for the loess smooth function
`transpose`	if TRUE, transpose the x3p matrix