fo superscript fix

[abcconsulting]

Hello,

I think there's a typo in VerticalAligment.setXslFO method. It sets superscript as "sup" and that produces the following exception in FOP:

ERROR org.apache.fop.apps.FOUserAgent - Invalid property value encountered in vertical-align="sup": org.apache.fop.fo.expr.PropertyException: null:1:897: No conversion defined sup; property:'vertical-align' (See position 3:120)

According to http://www.w3.org/TR/xsl/#vertical-align possible values are "baseline | middle | sub | super | text-top | text-bottom | <percentage> | <length> | top | bottom | inherit". fop.xsd bundled with docx4j is correct. I'm enclosing patch that fixes this little issue.

[jason]

Thanks for this; applied as http://www.docx4java.org/trac/docx4j/changeset/1762

[abcconsulting]

Thank you!