Regression test for HTML generation (using XMLUnit)

pom.xml

...textgrid/services/aggregator/html/HtmlRegressionTest.java

src/test/resources/11sqw.0.html

src/test/resources/mjr3.0.html

src/test/resources/mr23.0.html

src/test/resources/mr47.0.html

src/test/resources/msdd.0.html

src/test/resources/nbvb.0.html