Eccentric dipole coordinates #607
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…ecdipeval routine
…aries for eccentric dipole support
…options to calculate model vectors at all possible grid locations or only where data are available, or to calculate residual velocity vectors between model and observations
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This is a fairly large pull request which adds support for eccentric dipole coordinates across the RST. Notably, one can now perform the complete FITACF -> grid file -> map file processing scheme (ie Map Potential) using eccentric dipole coordinates rather than AACGM(-v2). To do so, I have re-derived the TS18 model coefficients in eccentric dipole coordinates; note that no other statistical models are currently supported by
map_addmodelorsolve_modelwith the-ecdipoption. There is also anecdipevalroutine which can be used for testing transformations between geographic and eccentric dipole coordinates. And finally, I've added IDL DLM support for the eccentric dipole transformations and also for the other IGRF routines, making the implementations consistent between IDL and C.