TIFF I/O - make `read_stripped` handle both RGBA and raw encoded strips (#3670)
TIFF I/O - make `read_stripped` handle both RGBA and raw encoded strips (#3670)

lightmare/mapnik,lightmare/mapnik,lightmare/mapnik,naturalatlas/mapnik,mapnik/mapnik,mapnik/mapnik,naturalatlas/mapnik,mapnik/mapnik,tomhughes/mapnik,tomhughes/mapnik,naturalatlas/mapnik,mapnik/mapnik,lightmare/mapnik,naturalatlas/mapnik,tomhughes/mapnik,tomhughes/mapnik