2.7.8 news section
Issue #21383: Allow "make touch" to work when building outside of the
source directory.
Issue #21383: OS X installer builds now use "make touch".
Issue 21198: Minor tarfile documentation bug.
Issue 21479: Fix markup for the TarFile.open() classmethod.
Issue #21545: Add .pop example and tweak comment about pure mutation methods.
Patch prepared by David Harrigan.