Fix inconsistencies between programs and their usage
messages, correct instances where information seems
to be missing or lost. This includes missing arguments,
making usage consistent with manuals, and so on.
when there where multiple syscalls returning out of order,
it would print blank lines between the exits. avoid this
by remembering if the last char written was a newline and
conditionally insert newline on out of order return.
sometimes, ratrace would return before all messages have
been printed. make the writer process the parent so ratrace
wont exit until all readers are finished avoiding the
problem.
