Update the z min/max inside readonly subsets #5948
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When a matrix is passed by reference and there is no need to switch to duplication, we adjust the grid's pad to simulate a cut. However, we never updated the header zmin/zmax to reflect the new data region. This PR takes care of this for grids (and cubes). Closes #5294.
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When a grid via a matrix is passed by reference and there is no need to switch to duplication, we adjust the grid's pad to simulate a cut. However, we never updated the header zmin/zmax to reflect the new data region. This PR takes care of this for grids (and cubes). Closes #5294.
PS: In the process I moved the relevant functions from gmt_grdio.c to gmt_api.c since they were only called there and this eliminates some duplication of macros as well as eliminating a few exported functions.