stderr_printf patch

Hi,

This patch makes SableVM put all VM messages on stderr.  It is useful 
for doing diffs on benchmark output between VM's, and for separating 
error and log messages from Java output.

A better solution would see 4 output streams:

java_stdout
java_stderr
sablevm_stdout
sablevm_stderr

and the use of properties to select where they go (the user could 
specify either file descriptors or file names).

However, Greg and I discussed that we want the default to be:

  stream       descriptor
=========================
java_stdout      1
java_stderr      2
sablevm_stdout   2
sablevm_stderr   2

and this patch gives that behaviour.  It is definitely better than what 
was there before, a mix of stderr and stdout all over the place.

I just did s/stdout/stderr/g on all files, and killed an unused 
_svmf_printf declaration in util.h.

svn diff -r3117:3118
svn+ssh://svn.sablevm.org/public/developers/chris/sandbox/stderr_printf/

Cheers,
Chris

P.S.  I have some other cleaning-up kind of things to do (elimination of 
cloned code primarily).  I will make different patches for them.