convert: start parsing arguments more flexibly In particular, allow default pot values (all at noon), and specifying input and output files rather than always doing stdin/stdout. And no, this is still not all that smart, but it is at least a tiny bit more flexible than it used to be, and the Makefile has been updated accordingly. Also, when F_SETPIPE_SZ is available, use it to limit the buffering of the output if it's a pipe. That, together with the very limited buffering by 'make_one_noise()' should make this somewhat real-time if the target i sreading a pipe and doesn't have huge input buffers. Put another way: if I add interfaces to modify the pots concurrently, that hopefully actually takes effect in a timely way. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>