Log Message:
Update to 2.0.3.

Upstream changes:

20150804 dholland	System/161 2.0.3 released.
20150714 dholland	Fix the serial port FORCE logic meant to prevent
........		interrupt flapping. Thanks to Winnie Wu for a test
........		kernel and workload that reliably repeated the problem.
20150709 dholland	Recognize some obvious aliases for disk161 commands.
20150706 dholland	Add page on profiling to the manual.
20150706 dholland	Add dynamic profiling control to the trace device.
20150703 dholland	If profiling, write the profile out if we die().
20150703 dholland	Include seek times in disk activity trace output.

20150126 dholland	System/161 2.0.2 released.
20150126 dholland	Fix brown paper bag release. Sigh.
20150126 dholland	System/161 2.0.1 released.
20150121 dholland	Fix up some gdb threads issues appearing with gdb 7.8.
20150117 dholland	Update included .hgignore file, from Cary Gray.

20150115 dholland	System/161 2.0 released.
20150115 dholland	Add workaround to make disk rotdelay deterministic.
20150114 dholland	Fix stdint.h-related build problems on Linux.
20150114 dholland	Fix flock-related build problem on Linux.
20150109 dholland	Add software debugger requests to the trace device.
20150105 dholland	Make the testsuite run.
20150105 dholland	Add support for installing into a chroot/DESTDIR.
20150105 dholland	Add man pages for all executables.