[EJP] add function vortex2delft_3D_FM_nc#108

tausiaj merged 2 commits intodevelopGeoOcean/BlueMath_tk:developfrom

88-document-and-test-greensurge-and-ocsmeshGeoOcean/BlueMath_tk:88-document-and-test-greensurge-and-ocsmeshCopy head branch name to clipboard