BUG DESCRIPTION:----------------Presently, hist3d() is a 3D bivariate BAR plot. This function is useful. It must be kept. But 1) it is badly named: an histogram is defined for a continuous variable, or 2 continuous variables. Histogram steps are continuous, with no space between them.2) it usurps a true missing needed hist3d() function.This is why the current hist3d() shall be renamed bar3d().This will leave the place for a true hist3d().OTHER INFORMATION:------------------I have implemented a true hist3d(). I will write a SEP to announce and discuss actual expected features.If both sets of syntaxes can be distinguished, it would be relevant to redirect former usages of hist3d()to bar3d(), in addition to a warning message.