Recursive dependency on dom4j

[htgoebel]

jaxen requires dom4j for compiling. and dom4j requires jaxen for compiling.

This inhibits building both packages from source (read: without basing .jars downloaded elsewhere). Building software from pure source is important to provide a verifiable path from source code to binary, see reproducible builds.

Please remove this dependency-cycle. Thanks.

[wltjr]

@htgoebel need to refile with https://github.com/jaxen-xpath/jaxen/issues, pretty sure this repo is unmaintained.

[htgoebel]

@wltjr Thanks.