Merge branch 'maint-0.4.0' into release-0.4.0

changes/bug30894

@@ -0,0 +1,4 @@
+  o Minor bugfixes (memory leaks):
+    - Fix a trivial memory leak when parsing an invalid value
+      from a download schedule in the configuration. Fixes bug
+      30894; bugfix on 0.3.4.1-alpha.

changes/bug31003

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+  o Minor bugfixes (crash on exit):
+    - Avoid a set of possible code paths that could use try to use freed memory
+      in routerlist_free() while Tor was exiting.  Fixes bug 31003; bugfix on
+      0.1.2.2-alpha.

changes/ticket30871

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+  o Major bugfixes (circuit build, guard):
+    - When considering upgrading circuits from "waiting for guard" to "open",
+      always ignore the ones that are mark for close. Else, we can end up in
+      the situation where a subsystem is notified of that circuit opening but
+      still marked for close leading to undesirable behavior. Fixes bug 30871;
+      bugfix on 0.3.0.1-alpha.