Some anti-forensics paranoia...

sed -i 's/BN_free/BN_clear_free/g'
changelog for 10793
Merge remote-tracking branch 'origin/maint-0.2.4'
Make the handling for usable-exit counting handle ExitNodes better

It's possible to set your ExitNodes to contains only exits that don't
have the Exit flag.  If you do that, we'll decide that 0 of your exits
are working.  Instead, in that case we should look at nodes which have
(or which might have) exit policies that don't reject everything.

Fix for bug 10543; bugfix on 0.2.4.10-alpha.
Merge remote-tracking branch 'public/bug10543_024_v2'
Merge remote-tracking branch 'public/bug9716_024' into maint-0.2.4
Merge remote-tracking branch 'origin/maint-0.2.4'