* replace lzma with current xz-utils

* add po4a build dep to xzutils

* Add xzutils, pixz

* is_fake doesn't need source_url

* add pixz tpxz format support to crew

* Add xzutils to pixz deps

* Add pixz if not installed.

* change pixz logic

* pixz changes

* xzutils is a runtime dep for pixz

* grammar fix

* remove pixz warning