Install wizard -> window-modal, fix missing import

gui/qt/installwizard.py

@@ -62,17 +62,17 @@ class CosignWidget(QWidget):
 
 
 
-class InstallWizard(QDialog):
+class InstallWizard(WindowModalDialog):
 
     def __init__(self, app, config, network, storage):
-        QDialog.__init__(self)
+        title = 'Electrum' + '  -  ' + _('Install Wizard')
+        WindowModalDialog.__init__(self, None, title=title)
         self.app = app
         self.config = config
         self.network = network
         self.storage = storage
         self.setMinimumSize(575, 400)
         self.setMaximumSize(575, 400)
-        self.setWindowTitle('Electrum' + '  -  ' + _('Install Wizard'))
         self.connect(self, QtCore.SIGNAL('accept'), self.accept)
         self.stack = QStackedLayout()
         self.setLayout(self.stack)

gui/qt/main_window.py

@@ -40,20 +40,17 @@ from electrum.i18n import _
 from electrum.util import block_explorer, block_explorer_info, block_explorer_URL
 from electrum.util import format_satoshis, format_satoshis_plain, format_time
 from electrum.util import PrintError, NotEnoughFunds, StoreDict
-from electrum import Transaction
-from electrum import mnemonic
+from electrum import Transaction, mnemonic
 from electrum import util, bitcoin, commands, Wallet
 from electrum import SimpleConfig, COIN_CHOOSERS, WalletStorage
-from electrum import Imported_Wallet
-from electrum import paymentrequest
+from electrum import Imported_Wallet, paymentrequest
 
 from amountedit import BTCAmountEdit, MyLineEdit, BTCkBEdit
 from network_dialog import NetworkDialog
 from qrcodewidget import QRCodeWidget, QRDialog
 from qrtextedit import ScanQRTextEdit, ShowQRTextEdit
 from transaction_dialog import show_transaction
-
-
+from installwizard import InstallWizard