-Jz on 'flat' modules about gmt HOT 5 CLOSED

I understand what you mean by flat (no grdview) but some of these I think consider a z-coordinates and then -R and -Jz do enter into what level we plot the flat stuff at, no?

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I first thought that this could be just removed in GMT6 that allows breakages, though this one would be a very minor one. And I sill do but it requires more changes. As is, if the testing machinery finds a -R1/2/3/4/5/6 it will error if no -Jz is present. This implies that a -Jz becomes mandatory if we have a solitary -R that follows a previous -R setting with all 6 params. This is what actually happens in the psxyz/3dbars.sh test. But I think this is the only reason why we may have to consider z-coordinates in the flat modules.

We should be able to solve this easily if only grdview`, psxyzand psbasemap use, and test, -Jz. With this and for backward compat reasons we could still accept, and ignore, -Jz in all flats and make clear in docs that in GMT6 the z-axis is only configurable in grdview, psxyz and psbasemap

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Time to close, @joa-quim ?

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Solved in #860

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