Added the three COPYING files for the three licences,
and the TEMPLATE.SOURCECODE.HEADER to go at the start of new source
files

This filter implementation is directly based on
XmlFilterAdaptor and simply dumps the SAX events
provided by the XmlFilterAdaptor to an outputstream.
It currently still lacks the advanced pretty printing
available through split-long-lines.xsl in the xslt based
flat xml filter.

Check for mdds >= 0.5.0 as sc now needs it...

Otherwise we have problems with paths containing spaces - they don't get
quoted in some cases.

Conflicts:
	scp2/source/extensions/directory_extensions.scp

Here it only gets used for non-Windows and non-Linux. It will current defaults
to using these "internal" headers like we do for xrender and friends.