Feature request: read deeptile with InputPart/InputFile

[fnordware]

Imf::InputFile (and Imf::InputPart) can now read and convert SCANLINEIMAGE, TILEDIMAGE, and DEEPSCANLINE. All that's left to add is DEEPTILE, please!

I guess the first step in that would be to get DeepScanLineInputFile to convert a tiled file if it can't already.

[dvicini]

It would be nice to finally have this fixed. It seems more like a bug to me than an additional new feature, since the documentation of OpenEXR states that all different formats (deep/nondeep, tiled/nontiled) should be possible to read with the standard InputFile.