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Warp add rpcs (#2031)

* [warp_add_rpcs] initial update to reproject to support rpcs

* catch kwargs in _calculate_default_transform

* fix allocation of crs to wrong dataset (was src, now dst) in _calculate_default_transform. Specifically where we went from GDALCreateGenImgProjTransformer -> GDALCreateGenImgProjTransformer2

* pass kwargs to calculate_default_transform (to be passed to transformer

* update docstrings

* update documentation

* add debug messages for kwargs used to set Transformer options

* Don't capitalize RPC_DEM transformer option value, as it might be a path

* includes existing changes from https://github.com/mapbox/rasterio/pull/2030, better support for computation of calculate_default_transform with just gcps or rpcs

* adds testse

* Remove an empty line

Mainly to trigger a new build on travis-ci.com

* add new test file (Largely derived from RGB.byte.tif)

* Fix incorrectly encoding RPC metadata as transform options

Was checking for transformer option RPC_DEM in the RPC metadata by mistake

Co-authored-by: Sebastien Tremblay-Johnston <sebastien.tremblayjohnston@mdacorporation.com>
Co-authored-by: Sean Gillies <sean@mapbox.com>
Co-authored-by: Sean Gillies <sean.gillies@gmail.com>

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