Do not allocate huge temporary memory areas and objects while encoding
for file I/O, thus reducing an enormous memory usage for large buffers. See http://lists.gnu.org/archive/html/emacs-devel/2013-10/msg00180.html. * coding.h (struct coding_system): New member raw_destination. * coding.c (setup_coding_system): Initialize it to zero. (encode_coding_object): If raw_destination is set, do not create dst_object. Add comment. * fileio.c (toplevel): New constant E_WRITE_MAX. (e_write): Do not encode more than E_WRITE_MAX characters per one loop iteration. Use raw_destination if E_WRITE_MAX characters is encoded.
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