Let grdedit -D+c allow setting/removing default CPT for grid #6223
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Given the cpt is now one of the attributes, we need a way to add, remove, or change it via grdedit. This PR adds +c[-|cpt] to the -D option. If no argument is used then we add the default CPT (turbo), if argument is - we remove any default CPT from the grid, else we add the specified CPT. The PR also fixed a bug that failed to consider NaNs as the NaN values and thus lead to unnecessary reading.