Read alpha values from indexed images. Always read indexes from indexed images. * __magick_read__.cc (read_indexed_images): turn function into template to remove duplicated loop. Create alpha channel from alpha values colormap. Skip reading of colormap unless requested. Use fortran_vec to fill the image instead of indexing the Array<T> with a dim_vector which requires multiple calls to dim_vector::operator() per iteration. (__magick_read__): Always read the indexes of an indexed image and not the RGB or grayscale values when no colormap is requested for output (Matlab compatibility). * imread.m: document that an indexed image is always read as such, independently of the colormap having been requested or not. * NEWS: add note on the change for reading indexed images.

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