changegroup: move _packellipsischangegroup() from narrow...
changegroup: move _packellipsischangegroup() from narrow
The behavior here is not ideal, as the function constructs a
packer then adds attributes to it. This will be cleaned up in
subsequent commits. Moving this code is necessary to move the
remainder of the bundle2-level changegroup part generation code
into core.
Differential Revision:
https://phab.mercurial-scm.org/D4061