Never remove database files on shutdown, it caused unreadable wallets on some testers' machines.

src/db.cpp

@@ -28,11 +28,6 @@ DbEnv dbenv(0);
 static map<string, int> mapFileUseCount;
 static map<string, Db*> mapDb;
 
-static bool fRemoveLogFiles = false;
-void RemoveLogFilesOnShutdown(bool fIn)
-{
-    fRemoveLogFiles = fIn;
-}
 static void EnvShutdown()
 {
     if (!fDbEnvInit)
@@ -48,24 +43,6 @@ static void EnvShutdown()
         printf("EnvShutdown exception: %s (%d)\n", e.what(), e.get_errno());
     }
     DbEnv(0).remove(GetDataDir().c_str(), 0);
-
-    if (fRemoveLogFiles)
-    {
-        filesystem::path datadir(GetDataDir());
-        filesystem::directory_iterator it(datadir / "database");
-        while (it != filesystem::directory_iterator())
-        {
-            const filesystem::path& p = it->path();
-#if BOOST_FILESYSTEM_VERSION >= 3
-            std::string f = p.filename().generic_string();
-#else
-            std::string f = p.filename();
-#endif
-            if (f.find("log.") == 0)
-                filesystem::remove(p);
-            ++it;
-        }
-    }
 }
 
 class CDBInit