Add python module for depmap and pom.xml processing

Testsuite is included as well but there are likely many cornercases to be better
tested
Refactor maven.prov to use new python library
Refactor maven.req to use new python library
Refactor maven_depmap to use new python library
Add xmvn_config module and testsuite
Add python replacements for 5 main mvn-* configuration scripts
Switch macros.xmvn to new python scripts
Remove unneeded xmvn_config_editor.sh
Modify installation of mvn_ scripts
Merge branch 'python-refactoring'
Rebase mvn-rpmbuild configs to version 20