Automatically transform between XML namespaces.

https://en.wikiversity.org/wiki/Automatic_transformation_of_XML_namespaces

This is an alpha. It is already useful to process XInclude, XML comments,
and some home-made XHTML extensions.

See https://vporton.github.io/xml-boiler-docs/ for help.

This project supersedes failed project
https://github.com/vporton/xml-boiler-java

==

The following organizations were asked to support this project:
* Linux Foundation (2017 Nov 1)
* Free Software Foundation (2017 Nov 1) [they don't provide funding]
* http://www.osc.dial.community (2017 Nov 7)
