feature/gnus-select2 updated (fe89760 -> e841a20)

[Andrew G Cohen]

acohen pushed a change to branch feature/gnus-select2.

      from  fe89760   Speed up marking read messages in nnselect
       new  141f7aa   Update header parsing in nnheader.el
       new  e841a20   Allow gnus backends to return a list of headers


Summary of changes:
 lisp/gnus/gnus-sum.el | 42 ++++++++++++++++++++++++++----------------
 lisp/gnus/nnheader.el | 27 ++++++++++++++++++++-------
 lisp/gnus/nnselect.el | 40 ++++++++++++++++++++++------------------
 3 files changed, 68 insertions(+), 41 deletions(-)