new sam for unix

[Scott Schwartz <schwartz@bio.cse.psu.edu>]

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Hi all,
  Rob Pike was kind enough to send me the source for the new
sam, and I've gone through and made the changes necessary to get
it to compile under unix.  I found one bug in the process, so 
I hope everyone else will look things over carefully too.

The changes: 
- replaced anonymous unions with ansi-std ones.
- used a plan9-flavor print library instead of stdio (mostly).
- the sam err file in tmp is now given a unique name, to
   avoid symlink races.  mktemp used where necessary.
- all plumbing is stubbed out.  maybe we can revisit this after the
   next edition of plan 9 is published.

This version appears to work with samterm, but it does exercise what I
think is a problem with the X11 version of that.  If I create a large
file, all lines the same length, and make a global substitution, and
then repeatedly undo and redo, samterm appears to miss some
characters.


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