dsynth - pty CRs, readelf, better log formatting
* Remove CR's from build logs (set tty modes on the pty).
* Parse 'readelf -x .note.tag /bin/sh' to get the operating
system and __DragonFly_version... basically the release name.
Compare the operating system name against what we get back
from the system as a validator.
* Improve the log format to make it more readable. Certain elements such
as statistics and times are right-justified.
* Filter certain log lines from stdout when curses mode is turned off.
* Highlight stdout lines for SUCCESS in green and FAILURE and red.
UnifiedSplitRaw
