Identify independent locations of jump dispersal
     
    
    Usage
    group_jumps(jumps, gap_size = 15)
 
    
    Arguments
- jumps
- A dataset to be processed 
- gap_size
- Distance between the invasion front and the positive point
necessary for it to be considered a jump, in kilometers (default: 15) 
 
    
    Value
    The same table as dataset with an additional column named
group and containing the group number for each jump
     
    
    Examples
    if (FALSE) { # \dontrun{
new_dataset <- group_jumps(dataset)
} # }