[DOC] add diagrams of queuing and future ACL design
These ones have remained for many months out of tree. Let's merge them.
diff --git a/doc/acl.fig b/doc/acl.fig
new file mode 100644
index 0000000..253a053
--- /dev/null
+++ b/doc/acl.fig
@@ -0,0 +1,229 @@
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diff --git a/doc/queuing.fig b/doc/queuing.fig
new file mode 100644
index 0000000..8d57504
--- /dev/null
+++ b/doc/queuing.fig
@@ -0,0 +1,192 @@
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