#1 Bug when opening some ArcInfo grids (different header info)

[Francisco Dueńas]

Hi the option for including the arinfo Grid files is great,
but some times teher occur some errors when if the
arcgrid format file is a bit newer (arInfo 8 and up) the
header lkines are differet, some times it will have two
new values:

xdim
ydim

they replace the 'cellsize' identifier so thecoordinates will
be more exact because it will have x and y dimmesions
independently, so when i open a grid like this it throws
me and error: NODATA_value is nto a valid floating
value. but the problem is not with the NOData_value iden
tifier, is it because the header has has 1 more line than
expected.

Myabe changin the parser could fix this