all: Remove build_vw_asp.csh from repo

This is specific to David Shean's system. Not applicable to everyone
else.
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pc_align:More memory reduction
sparse_disp: Pass threads value to it
sparse_disp: rm debug code
stereo_utils: Need to make it work for parallel_stereo too
pc_align: Code cleanup
pc_align: More tool and documentation tweaks
stereo_utils: pass opt.threads to sparse_disp
stereo: default threads set to ncpu
sparse_disp: default min coarse pts is now 8
sparse_disp: consistent quality mask output
stereo_utils: verbose print wall time
stereo_utils: sparse_disp_options trumps --threads