message: Indicate in the UI that the database upgrade is in progress
  If bitcoin-qt is being used then a message will be sent
  to the screen to alert the user that the database upgrade
  process is still continuing.
diff: #include "main.h"
  #include "pow.h"
  #include "uint256.h"
  +#include "ui_interface.h"
  #include <stdint.h>
  @@ -367,6 +368,7 @@ bool CCoinsViewDB::Upgrade() {
  }
  LogPrintf("Upgrading database...\n");
  + uiInterface.InitMessage(_("Upgrading database...this may take a while"));
  size_t batch_size = 1 << 24;
  CDBBatch batch(db);
  while (pcursor->Valid()) {
  