[GRASS5] r.out.ascii: added optional SURFER .grd support

[Markus Neteler]

Hi all,

I have added optional SURFER ASCII .grd support for r.out.ascii:

 r.out.ascii [-hsi] input=name output=name [dp=value] [null=name]
  -s   Write SURFER (Golden Software) ASCII GRID instead of GRASS ASCII GRID

Surfer needs a slightly different header and reverted row order which
is provided now. NULL values are (re-)coded properly for SURFER.

In case of problems, let me know.

Cheers,

 Markus

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