add more functionality to the SimpleTransform sample program

[andreas-ibm]

When experimenting with stylesheets and bugs, I find I need to run the same stylesheet/xml through different engines to see what they do, with that in mind I've expanded the SimpleTransform sample program to take more arguments, so that I can e.g. run:

$JAVA_HOME/bin/java -cp $(ls -1 ~/Development/xalan-java/build/*.jar | tr '\n' ':') samples.SimpleTransform.SimpleTransform ~/test6.xsl ~/test6.xml test6-output.xml org.apache.xalan.xsltc.trax.TransformerFactoryImpl

to

• take my selected Java
• grab all the xalan jars on classpath
• run the simpleTransform sample
• take test6.xsl as the stylesheet to run (defaults to birds.xsl to ensure backwards compatibility)
• take test6.xml as the input to drive the stylessheet (defaults to birds.xml to ensure backwards compatibility)
• output to test6-output.xml (defaults to birds.out to ensure backwards compatibility)
• use the org.apache.xalan.xsltc.trax.TransformerFactoryImpl to process the stylesheet/xml pair. Defaults to javax.xml.transform.TransformerFactory but uses forName instead of getInstance now...