Plot SIA and new regional means
Add turq color. Change NSIDC to turq
Add calc_regtotseaicearea()
Add new regions. bks, soo (Barents-Kara, Okhotsk) plus variations on eurasia.
Plot new regions
Add option to have 2 variables, 2 regions, and 2 seasons in the scatter plot
Add check for SIA in regional mean calc. Fix bug where isarea=True isnt' a param to calc_totseaicearea()
Initial commit. Test plotting of wind vectors on map.