more fixes for computation of lonmin, lonmax
fix ambiguity in lonmin, lonmax when projection crosses dateline.
add ArrowStyle |-|
Axes.draw rearranged to support rasterization
rec2csv raises explicit error when recarray ndim not 1
tests: add tests for rec2csv and csv2rec
mplot3d: support contours in directions other than z
FancyArrowPatch.__str__ updated
add BracketAB arrow style
Mplot3d: fix scatter3d markers bug