Add package dependancy about mobr HOT 10 CLOSED

Also add package rgl which is used by the function plotSNpie. I can see that on my server which is a "headless" machine I have some trouble installing rgl which means we may want either a more general solution to rgl such as suggested here: http://stackoverflow.com/questions/37521259/using-rgl-with-headless-display or some method way of keeping the function unchanged and just printing a warning that it doesn't work on headless machines. I'm leaning towards the latter option which requires less work.

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the specific function the rgl package needs is plot3d. Also the function plotSADs needs scales::alpha for setting transparent colors

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I think rgl and scales should be listed as "Suggests" rather than "Depends" in the description file and therefore will not be installed when mobr is installed because they are such fringe cases and at least rgl will cause trouble on headless machines.

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I can no longer seem to remember where in the package quadprog is needed this package only has two functions: solve.QP and solve.QP.compact. I don't think we use either of these so maybe I made a mistake @rueuntal does this ring any bells?

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@dmcglinn thanks for looking into the details! What you suggested for rgl and scales sound very reasonable to me. I don't remember quardprog either - could it have crept in when we were testing all the different algorithms for aggregation? And I don't recall anything relying on optimization at the moment. Let's get it removed.

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After having moved several packages from the Suggests category to the Depends category many more install errors are occurring due to needed second order dependancies. Here is a list of packages that resulted in errors: htmlwidgets, quadprog, shiny, munsell, SpadeR, and plotrix. It appears SpadeR caused a problem because it is listed as a remote but not as a Depends.

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Hey @dmcglinn - sorry I'm a bit confused, what do we need to do here?

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Got it. Thanks.

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Hi @dmcglinn,

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