Fixes per Vigilant Sentry (http://www.vigilantsw.com/)

* Fix memory leaks.

* Add comments about initializations and checking for successful results.

* Add checks for NULL deref.

* Consistency in "TODO" vs "TO-DO" comments!

src/AutoRecovery.cpp

@@ -220,7 +220,8 @@ static bool RecoverAllProjects(AudacityProject** pproj)
 bool ShowAutoRecoveryDialogIfNeeded(AudacityProject** pproj,
                                     bool *didRecoverAnything)
 {
-   *didRecoverAnything = false;
+   if (didRecoverAnything)
+      *didRecoverAnything = false;
    if (HaveFilesToRecover())
    {
       AutoRecoveryDialog dlg(*pproj);