Synched local and repos

os/ass1/interval.c

os/ass1/interval.h

os/ass1/main.c

os/ass1/meten.c

os/ass1/testcache.c

os/ass2/mem_alloc.h

os/ass2/mt19937.h

os/ass2/mt19937ar.c

os/ass2/scheduler.c

os/ass2/scheduler.h

os/ass3/fishbones.c

os/ass4/main.c

os/ass5/index.c

os/ass5/index.h

os/ass5/isam.c

os/ass5/isam.h

os/ass5/isam_bench.c

os/ass5/isam_test.c

portfolio/vcs/vcs.tex