message: label completion by known address input.
diff: #include <QDoubleValidator>
  #include "optionsmodel.h"
  +#include "addresstablemodel.h"
  #include "guiutil.h"
  #include "bitcoinunits.h"
  #include "qt/pivx/qtutils.h"
  @@ -92,6 +93,10 @@ bool SendMultiRow::addressChanged(const QString& str){
  ui->lineEditAddress->setProperty("cssClass", "edit-primary-multi-book-error");
  } else {
  ui->lineEditAddress->setProperty("cssClass", "edit-primary-multi-book");
  + QString label = model->getAddressTableModel()->labelForAddress(trimmedStr);
  + if (!label.isNull()){
  + ui->lineEditDescription->setText(label);
  + }
  }
  updateStyle(ui->lineEditAddress);
  return valid;
  