j2k/jpeg2000: merge a few whitespaces

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
j2k/jpeg2000: Partially merge quantization code

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
j2k: change fixed point of stepsize to 16.16

This seems more natural and matches jpeg2000

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
j2kenc: Allow encoding with the 9/7 wavelet

Also add a fate test that tests 9/7

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>