Replace nearly all XXX0vv comments with smarter ones

So, back long ago, XXX012 meant, "before Tor 0.1.2 is released, we
had better revisit this comment and fix it!"

But we have a huge pile of such comments accumulated for a large
number of released versions!  Not cool.

So, here's what I tried to do:

  * 0.2.9 and 0.2.8 are retained, since those are not yet released.

  * XXX+ or XXX++ or XXX++++ or whatever means, "This one looks
    quite important!"

  * The others, after one-by-one examination, are downgraded to
    plain old XXX.  Which doesn't mean they aren't a problem -- just
    that they cannot possibly be a release-blocking problem.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/or/transports.c b/src/or/transports.c
index 1b8b1e678c..92539b1693 100644
--- a/src/or/transports.c
+++ b/src/or/transports.c
@@ -1363,7 +1363,7 @@ create_managed_proxy_environment(const managed_proxy_t *mp)
       }
     }
 
-    /* XXX024 Remove the '=' here once versions of obfsproxy which
+    /* XXXX Remove the '=' here once versions of obfsproxy which
      * assert that this env var exists are sufficiently dead.
      *
      * (If we remove this line entirely, some joker will stick this