check_pephylo: View PEPHYLO input files
In rscherrer/bop:

This function displays the files in the input folder for PEPHYLO, to check they are alright before running the program.

1	check_pephylo(filename, outpath, plotit = T)

`filename`	Either a string with the name of the file to be viewed, either of "MetricTraitMeans", "MetricTraitStds", "MetricSpNames", "SpExt", "MetricRates" or "Trees", with or without the ".txt" extension. Or, an integer representing the position of the file to view in the list described in the previous sentence.
`outpath`	A string. The path to the folder where the output file is to be saved.
`plotit`	Logical. Whether to plot the first phylogeny provided (applicable only if filename is Trees.txt or 6).