More support for BGT example files Geonovum - Maastricht

For some tests to load BGT data from a sample file of Maastricht (see input data), I've made some changes to the bgt-example. I added an XSLT that includes some missing types from the original XSLT.

Also I added some examples for other outputs.

Could this be tested and if okay, be added to Stetl master?
If there any issues, let me know.