Add option to create geometric bodies (spheres, prisms, ellipsoids, etc) and compute their effect.

[joa-quim]

Tested for a couple of them (bodies) but not all.

[PaulWessel]

You cannot break the +modifier syntax since we will auto-compute these from long-forms, eventually. Things like -M+bell is not a modifier since bell is a word. It has to be, e.g., -M+sbell where +s means shape. We can then later handle -Mshape=bell in long-form and auto-convert to -M+sbell. So need to be +scylinder (see typo), +scone, +sprism, etc.

Type Alaternative.

[joa-quim]

OK, -M+ssphere it is.

[PaulWessel]

You need to merge master into this first, no. Otherwise, I see you are reverting several things in master related to recent bug fixes, e.g., in gmt_io.c, grdcut.c, grdedit.c.
Your test script is missing the **+**s modifier.
The listing of bell,height, etc should be italics not bold since these are parameters, and you have several references to instead of height in that section (i.e., there are lots of these). Pirimid -> Pyramid.

[joa-quim]

I had merge master but had conflicts and ended up no committing all master changes in this branch. Had also forgotten to commit the cube_mag.sh test update to +s.

[joa-quim]

Ping

[PaulWessel]

Think you have to do all those Mimi commits

[PaulWessel]

Mini

[seisman]

@joa-quim manually fixed the typos in the commit 70c1196.

You don't have to do that. You can just click the "Commit suggestions" button.

[seisman]

Ping @joa-quim

Following bash scripts may not have execute permission:
1: ./test/potential/cube_mag.sh

[joa-quim]

They are committed.

[PaulWessel]

OK, I guess you did not use the buttons we set up for you to click commit as they all show up there, so harder to see if they were fixed. Also, per @seisman the script does not have executable permission so please fix that so we can approve.
Sorry, slow day with family insisting on morning swim

[joa-quim]

The script has the +x permission on my side. But the commit doesn't believe it.

[PaulWessel]

OK, will fix if needed.

[seisman]

The script has the +x permission on my side. But the commit doesn't believe it.

FYI, I added the +x permission to the script and pushed the change directly to the master branch.

[seisman]

@joa-quim This PR introduces some compiler warnings:

../../src/potential/gmtgravmag3d.c:243:7: warning: unused variable 'ptr' [-Wunused-variable]
        char ptr[GMT_LEN256] = {""};
             ^
In file included from ../../src/potential/gmtgravmag3d.c:667:
../../src/potential/solids.c:37:3: warning: '/*' within block comment [-Wcomment]
                /* first triangle */
                ^
../../src/potential/solids.c:108:1: warning: '/*' within block comment [-Wcomment]
/*      as a union of triangular facets. Returns number of triangles. */
^