mapsf_0.12.0

Fix

• use 1/4 of line for typical offset space (title, credits, scale bar, north arrow etc.) (#74)
• change text adj to allow multiple lines titles in mf_title()
• make mf_inset_*() work on split windows (#77)
• add a message when values are outside class limits for type="choro"

Feat

• add cex and adj args to mf_arrow(), better arrow shape, better real north adjustemnent
• add mf_get_pencil() function to create a pencil layer from a polygon layer
• add "Q6" and "ckmeans" classification methods to mf_get_breaks()
• add mf_get_borders() to extract borders from contiguous polygons