message: Add tooltips to InstructionModel
diff: @@ -55,14 +55,14 @@ bool InstructionModel::setData(const QModelIndex& index, const QVariant& value,
  }
  QVariant InstructionModel::headerData(int section, Qt::Orientation orientation, int role) const {
  - if (orientation == Qt::Horizontal && role == Qt::DisplayRole) {
  + if (orientation == Qt::Horizontal && (role == Qt::DisplayRole || role == Qt::ToolTipRole)) {
  switch (section) {
  case Column::Breakpoint:
  - return "BP";
  + return role == Qt::DisplayRole ? "BP" : "Breakpoints";
  case Column::PC:
  - return "PC";
  + return role == Qt::DisplayRole ? "Addr" : "Instruction Address";
  case Column::Stage:
  - return "Stage";
  + return role == Qt::DisplayRole ? "Stage" : "Stages currently executing instructon";
  case Column::Instruction:
  return "Instruction";
  default:
  