There's a line with a stray 'processor' in the ARM /proc/cpuinfo that
doesn't start in the first column. Let's not count that.

The liblitmus Makefile generates a config.inc makefile that makes the
liblitmus configuration available to third-party projects. This commit
switches ft_tools from the old SConstruct (which did all the
configuration itself to a much simpler Makefile based on including
config.inc.

As a new feature, this automatically picks up all compiler options
from liblitmus and thus automatically supports cross-compilation.

Feather-Trace devices are now being created by udev in /dev/litmus.

This patch makes the st_trace script controllable by SIGUSR1.  This
is useful for integrating tracing into an automated script since
st_trace previously was controlled by human input ("Press Enter to
end tracing...").  The old method is still used by default.  Use '-s'
to make st_trace wait for SIGUSR1 to terminate tracing instead.

Note that you can send SIGUSR1 to st_trace with the following example
commands:
> pkill -SIGUSR1 st_trace
> kill -SIGUSR1 <PID for st_trace>

Also, adjust line breaks to fit within 80 chars.