Version 1.6.11beta04 [April 19, 2014]
Made progressive reading of interlaced images consistent with the
behavior of the sequential reader and consistent with the manual,
by moving some code out of the PNG_READ_INTERLACING_SUPPORTED blocks.
The row_callback now receives the proper pass number and unexpanded rows,
when png_combine_row is not used or not built,
Allow PNG_sRGB_PROFILE_CHECKING = (-1) to mean no sRGB profile checking.