modify pupynere to create masked array when missing_value and/or _FillValue attribute is defined, and apply scale_factor and add_offset.
modify pupynere to create masked array when missing_value
and/or _FillValue attribute is defined, and apply scale_factor
and add_offset.

svn path=/trunk/toolkits/basemap/; revision=4431

matplotlib/basemap,matplotlib/basemap,guziy/basemap,guziy/basemap