mq-cat: redesign the command line interface
pin: regroup mq-cat with the main process
mq-cat: null-terminate correct buffer
pin(1): fix references to the -s flag
add pin(1) program and the manual page
make our root qid.path slightly more unique
rename Pipe -> Stream; misc refactoring
rearrange code; group Srv handlers together
insert into the list when pipe fully created