Revert "Revert "Add subroutines to xz and un-xz content""
Revert "Revert "Add subroutines to xz and un-xz content""

This reverts commit ae7621bf0266e9809a1cb157670db13834af1f5c.

berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud