Fix indentation white space (replace tabs w/ spaces only)

This is not a huge issue but my editor is configured to use spaces
by default and I often forget to change it so making everything
match my default is easier for me.
Fix bug in Match() output

The string passed to Expected() was a bad translation from Pascal to
Python.  The old version printed out the literal string " + x + "
which was not the intent of the original implementation.  The intent
was to be the value of var x surrounded by single quotes.
Fix Emit() and EmitLn()

These were both outputting one too many newline characters.