Revised plot_sample() to allow specification of xlim and ylim.
Updated vignette to show use of plot_sample() (Issue #8).
Added function plot_sample() for plotting a selected row or column
from a distance/similarity matrix.
Added option distance="propdiff" to dist_betw_matrices() and
dist_betw_arrays().
Fixed typo in help file for dist_betw_arrays().
Removed use of svg in vignette.
Added argument threshold to get_problems()
Get rid of rownames from output of get_problems()
Added argument xlabel for hist_self_nonself() to control x-axis labels.
Added a vignette
Added example data
Added some more examples in the help files.
class() in is_cluster(). Instead of
"blah" %in% class(object), use inherits(object, "blah").