Fix #1858, #1689: don't kill temp agenda buffers (yet)
Fix #1858, #1689: don't kill temp agenda buffers (yet)

Some commands expect temporary org agenda buffers (opened by org-agenda)
to remain open, so instead of proactively killing them we remap
org-agenda-quit and org-agenda-Quit to org-agenda-exit, which does that
for us at a more appropriate time: when closing the agenda.

UndeadKernel/emacs_doom,hlissner/.emacs.d,hlissner/.emacs.d,UndeadKernel/emacs_doom,hlissner/doom-emacs,hlissner/.emacs.d,UndeadKernel/emacs_doom,hlissner/doom-emacs,UndeadKernel/emacs_doom,hlissner/.emacs.d,UndeadKernel/emacs_doom,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/.emacs.d,UndeadKernel/emacs_doom,hlissner/.emacs.d,hlissner/doom-emacs,UndeadKernel/emacs_doom,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs