correct register number in pixel-a.asm
intrapred: stack-check asm intra primitives

prune some extra memsets that were used during development
ipfilter: stack-check asm filter primitives
ipfilter: remove utterly useless comments
dct: stack-check asm transform/quant primitives
rest: move --hash into bitream options section, document error-recovery aspects
rest: loop filters, plural
rest: move --repeat-headers to bitstream options section
rest: move quality metrics section up higher
primitives: pass bool value as int to assembly

bool type is too ambiguous
dct: fix MSVC warnings
ipfilter: fix register stack allocation in luma horizontal filter
pixelharness: stack-check ssim_end4_t, this seems to expose an argument read bug