#24 wget line in basemap.gs needs to be updated.

[Muhammad Yunus]

Grads version: grads-2.2.1.oga.1-win32_superpack.exe
Installed and tested on 23 May 2019.
The URL for wget in the basemap.gs is outdated.
The original is:

* Get the polygon file from COLA if we do not have it
wget_it = 'wget ftp://grads.iges.org/grads/scripts/'file' .'
scrp = 'if test -e ' file '; then true; else ' wget_it '; fi'
'! bash -c "'scrp'"'

It should be changed into:

* Get the polygon file from COLA if we do not have it
wget_it = 'wget ftp://cola.gmu.edu/grads/scripts/'file' .'
scrp = 'if test -e ' file '; then true; else ' wget_it '; fi'
'! bash -c "'scrp'"'

Actually all the opengrads versions needs to be updated.