dist_all: Calculates distance between geocoordinates: all methods
In wolfm4ne/gcd: Great Circle Distance (GCD)

dist_all takes inputs of two sets of coordinates in (degree values), one set fo reach location, and a boolean indicator of whether or not to return the results as kilometers (km = TRUE) or miles (km = FALSE). The output is three distances using the methods of Spherical Law of Cosines, Haversine formula, and Vincenty inverse formula for ellipsoids.

1	dist_all(lat1, lon1, lat2, lon2, type = "deg", km = TRUE)

`lat1`	the latitude as radians of the first point
`lon1`	the longitude as radians of the first point
`lat2`	the latitude as radians of the second point
`lon2`	the longitude as radians of the second point
`type`	defaults to "deg", can also be "rad"
`km`	boolean argument for whether to return results as km (TRUE) or miles (FALSE)

# Input list of degree values
# Longitude values range between 0 and +-180 degrees
deg.lon <- runif(2, -180, 180)
# Latitude values range between 0 and +-90 degrees
deg.lat <- runif(2, -90, 90)

# Obtain measures of distance
gcd.mi <- dist_all(lon1 = deg.lon[1], lat1 = deg.lat[1]
  , lon2 = deg.lon[2], lat2 = deg.lat[2], km = FALSE)