Re: Use of GCPS in Rasterio

vincent.sarago@...
 

We added the `from_gcps` function to create a transformation matrix from gcps (see: https://github.com/mapbox/rasterio/pull/1773
This is a good first step but now when we open a file we still need to do something like 

```
with rasterio.open(src_path) as src_dst: 
    with WarpedVRT(src_dst, src_crs=src_dst.gcps[1], src_transform=from_gcps(src_dst.gcps[0])) as vrt_dst: 
        ...
```

Question: I wonder if it will be possible to add an option (or env variable) for the `open` method to force the use of crs and transform created from gcps. 

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