r.surf.gauss: Added seed option and flag

[cwhite911]

Addresses issue https://github.com/OSGeo/grass/issues/1044 to add seed parameter and flag for reproducible results to the r.surf.gauss module. However, tests are currently not present and should still be included.

[wenzeslaus]

I know this is a draft, but just to be clear, the compilation fails for raster/r.surf.gauss.

[cwhite911]

@petrasovaa I updated the tests to check the univar stats are correct,

[nilason]

The Labeler went nearly all-in for this. @echoix Do you perhaps know why?

[echoix]

I think it's because it was an old PR, and merging main in it meant a lot of changes in everywhere. But I'm not sure. Now we don't remove labels automatically, so a next commit should only use the ones that are defined.

If it is still unexpected, maybe a rebase would do the trick...

[nilason]

...merging main in it meant a lot of changes in everywhere....

That sounds plausible.

[echoix]

...merging main in it meant a lot of changes in everywhere....

That sounds plausible.

It doesn't worry that me that much.

[petrasovaa]

@cwhite911 see the discussion we had in https://github.com/OSGeo/grass/pull/3480#discussion_r1519351514, we basically decided not to use the -s flag, so this PR needs to be updated...

[cwhite911]

...merging main in it meant a lot of changes in everywhere....

That sounds plausible.

It doesn't worry that me that much.

This might of been my fault. When was catching this project up I rebased and had to go back and fix the branch by resetting it to your commit then cherry-picking the work I just did.