map2d_set modified to set explicitly !map2d.coord depending on the "aacgm" keyword
a bug fix for aacgmloadcoef.pro regarding !map2d.aacgm_dlm_exists
aacgm_load_coef in map2d_init replaced by the wrapper pro. aacgmloadcoef
a commit for map2d/map2d_set.pro was amended to the original one.