Add undocumented option to write a multi-segment as single segment fi… #109
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This new -Ms option makes almost no difference for command line but has a radical effect when called from external interfaces. From the MEX and Julia interfaces a multi-segment file is a struct array with each element carrying a segment. Plotting this in Matlab is annoying so we added the function
catsegto thegmt.mhelper file to join all segments in a multi-segment struct array. This PR just avoids this step and saves also from having to duplicate the dataset.Ideally this should be done at a more basic level and so be available to all multi-segment producing modules.