Let jvmtiGen exit with a non-zero exit code upon failure

[Carsten Varming]

Dear Serguei and Steffan,

Sorry about the late reply. The office was a little busy Friday.

Steffan's suggestion is to remove all the exception handling code sound
reasonable. I am not a fan of the main method throwing checked exceptions,
so I wrapped all the exception handling into a tiny handler that simply
prints the exception and exits with a non-zero value. I never cared much
for the stacktrace, so I put printing of the stacktrace under the verbose
flag.

Speaking of cleaning up, there is code in there to use Apache xalan instead
of the standard xslt processor due to an ancient bug fixed in Java 1.5. I
removed that as well.

There was also a comment about the field "document" being package globally
accessible due to: "ref'd by the tree-adapter". I have no idea what that
means, but changing document to a local variable in main didn't break the
build, so I guess that comment is out-of-date. Please let me know if I am
missing something here.

There was also a use of java.io.PrintStream. That class suppresses
IOExceptions: "Unlike other output streams, a PrintStream never throws an
IOException", so I removed the PrintStream as I want to get a failure when
something goes wrong.

I have put a new webrev at http://cr.openjdk.java.net/~cvarming/jvmtiGen.02/

Carsten
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