Change indentation style to put open paren inline, contents indented,

Change indentation style to put open paren inline, contents indented,
and close paren unindented.  Change indentation increment from 2 to 4.
Generate optional trailing ";" in bnodes and "." in subgraphs.  Don't
automatically indent multiple objects; instead try to break lines
where needed.  Add space after an unquoted literal, to prevent
confusion should it be followed by ".".