`assign_values_to_leaves_nodePar`, `assign_values_to_nodes_nodePar`, `assign_values_to_branches_edgePar` - If the value has `Inf` (instead of NA!) then the value will not be changed.

Also fix some assign_values_to_nodes_nodePar default values
Move from is.finite to !is.infinite - so to be able to handle characters and not just numbers!
NEW FUNCTIONS:
   * `as.dendrogram.pvclust` - extract the hclust from a pvclust object, and turns it into a dendrogram.
   * `hc2axes` - imported from pvclust, needed for text.pvclust
   * `text.pvclust` - imported from pvclust, adds text to a dend plot of a pvclust result
   * `pvclust_show_signif` - Shows the significant branches in a dendrogram, based on a pvclust object
   * `pvclust_show_signif_gradient` - Shows the gradient of significance of branches in a dendrogram, based on a pvclust object
Added pvclust - bump to 0.16.4