Plot the axis ticks' labels of a texture triangle plot.
TT.ticks.lab(geo, at = NULL, text.tol = NULL, text.sum = NULL,
blr.clock = NULL, tlr.an = NULL, tk.ls = NULL,
tri.sum.tst = NULL, tri.pos.tst = FALSE, col.axis = NULL,
font.axis = NULL, cex.axis = NULL, family.op = NULL)