Tool to examine uncompressed atrace output from an Android

This will help other tools who want to parse atrace output.

systrace.py in the SDK seems to prefer/assume? that it is working
with compressed content. I guess because the usual way of using
systrace.y is when it uses adb directly. So when using both
systrace and expander, use this procedure:

adb shell atrace -s -t 10 -z > /tmp/f
./expander.py /tmp/f

dos2unix -f -n /tmp/f /tmp/f.u
python systrace.py --from-file=/tmp/f.u

Signed-off-by: Tony Lofthouse <lofthous@amazon.com>