With the switch from using __NR_<syscall> to SYSCALL_<syscall>, things
were not intercepting system calls. Fix this, then fix the resulting
issues to get system call interception working again.
Add statistics computation and add open, close, and readv system calls.

o	Determine how ofter system calls are used in common executables.
o	Fix ftsync_buf processing
o	Switch from __NR_<syscall> to SYSCALL_<syscall> everywhere.
Add ability to run vi command and get its system call usage.
o	Change use of "exit" to "_exit" since that's the real system call
o	Rename ft-sync.h to ftsync-buf.h to allow for generic ft-sync.h
o	Flesh out the ioctl() implementation.