New functions tissot_map()
and tissot_abline()
to easily add contextual world map
data and location lines.
Improved ability to build more than one tissot and to easily plot multiple indicatrixes.
New function tissot_get_proj()
with no arguments, just gets the last value of a plot projection
registred by plot.indicatrixes.
Removed some old stuff.
Using PROJ and libproj, dev only versions.
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