* allout.el (allout-unprotected): Let inhibit-read-only only when
buffer-read-only isn't set.
(allout-annotate-hidden): Enable topic annotation during copies even
when the buffer is read-only, eg for topic copies. Ensure that the loop
advances, even when the span extends beyond the deletion region.
(allout-toggle-subtree-encryption): Use allout-structure-added-hook
rather than allout-exposure-changed-hook, as a stronger assertion.
(allout-keybindings-list): Add bindings for
allout-copy-line-as-kill and allout-copy-topic-as-kill.
(allout-copy-line-as-kill, allout-copy-topic-as-kill): copy
wrappers for allout-kill-line and allout-kill-topic.
(allout-listify-exposed): Position correctly to accumulate lines.