matplotlib Code

version bumps

Improve speed of quad mesh drawing (by about 25%)

tagged version 91.0 for release

add maskandscale kwarg to NetCDFFile:wq

make automatic masking and rescaling of variable data optional
in NetCDFFile.

Fix memory leak and increase performance in quadmesh drawing (Agg)

use PyNIO to read data if the pure python NetCDF reader fails
(PyNIO can read GRIB1+2, HDF4, NetCDF4 and HDFEOS2).

fix bug in drawparallels introduced in last commit

use dashes kwarg

fix typos