Apply PEP 8 style guidance to zenmap

Using the pep8 tool (https://pypi.python.org/pypi/pep8), fixed the
following style issues:

Count   Issue
11      E201 whitespace after '['
8       E203 whitespace before ','
41      E211 whitespace before '('
11      E221 multiple spaces before operator
61      E225 missing whitespace around operator
237     E231 missing whitespace after ':'
91      E251 no spaces around keyword / parameter equals
19      E261 at least two spaces before inline comment
41      E301 expected 1 blank line, found 0
200     E302 expected 2 blank lines, found 1
356     E303 too many blank lines (2)
563     E501 line too long (106 characters)
39      E701 multiple statements on one line (colon)
13      E702 multiple statements on one line (semicolon)
4       W291 trailing whitespace
2       W293 blank line contains whitespace
8       W391 blank line at end of file
21      W601 .has_key() is deprecated, use 'in'
2       W602 deprecated form of raising exception

The remaining issues are long lines due to very deep data structures. I
chose not to alter them, as it would involve backslash-continuation
where whitespace is not permitted:

./zenmapGUI/ScanInterface.py:323:80: E501 line too long (90 characters)
./zenmapGUI/ScanInterface.py:456:80: E501 line too long (84 characters)
./zenmapGUI/ScanInterface.py:464:80: E501 line too long (84 characters)
./zenmapGUI/ScanInterface.py:472:80: E501 line too long (122 characters)
./zenmapGUI/ScanInterface.py:479:80: E501 line too long (122 characters)
./zenmapGUI/ScanInterface.py:920:80: E501 line too long (94 characters)
./zenmapGUI/ScanInterface.py:923:80: E501 line too long (93 characters)
./zenmapGUI/MainWindow.py:575:80: E501 line too long (99 characters)
./zenmapGUI/MainWindow.py:906:80: E501 line too long (99 characters)

zenmap/zenmapGUI/ScanScanListPage.py

@@ -128,6 +128,7 @@ from zenmapGUI.higwidgets.higbuttons import HIGButton
 from zenmapGUI.higwidgets.higscrollers import HIGScrolledWindow
 import zenmapCore.I18N
 
+
 def status_data_func(widget, cell_renderer, model, iter):
     entry = model.get_value(iter, 0)
     if entry.running:
@@ -143,14 +144,17 @@ def status_data_func(widget, cell_renderer, model, iter):
         status = _("Canceled")
     cell_renderer.set_property("text", status)
 
+
 def command_data_func(widget, cell_renderer, model, iter):
     entry = model.get_value(iter, 0)
     cell_renderer.set_property("ellipsize", pango.ELLIPSIZE_END)
     cell_renderer.set_property("text", entry.get_command_string())
 
+
 class ScanScanListPage(HIGVBox):
-    """This is the "Scans" scan results tab. It the list of running and finished
-    scans contained in the ScansListStore passed to the constructor."""
+    """This is the "Scans" scan results tab. It the list of running and
+    finished scans contained in the ScansListStore passed to the
+    constructor."""
     def __init__(self, scans_store):
         HIGVBox.__init__(self)
 
@@ -159,7 +163,8 @@ class ScanScanListPage(HIGVBox):
         scans_store.connect("row-changed", self._row_changed)
 
         self.scans_list = gtk.TreeView(scans_store)
-        self.scans_list.get_selection().connect("changed", self._selection_changed)
+        self.scans_list.get_selection().connect(
+                "changed", self._selection_changed)
 
         status_col = gtk.TreeViewColumn(_("Status"))
         cell = gtk.CellRendererText()
@@ -193,9 +198,9 @@ class ScanScanListPage(HIGVBox):
         self.cancel_button = HIGButton(_("Cancel Scan"), gtk.STOCK_CANCEL)
         buttonbox.pack_start(self.cancel_button, False)
 
-        hbox.pack_start(buttonbox, padding = 4)
+        hbox.pack_start(buttonbox, padding=4)
 
-        self.pack_start(hbox, False, padding = 4)
+        self.pack_start(hbox, False, padding=4)
 
         self._update()
 
@@ -206,13 +211,13 @@ class ScanScanListPage(HIGVBox):
         self._update()
 
     def _update(self):
-        # Make the Cancel button sensitive or not depending on whether a running
-        # scan is selected.
+        # Make the Cancel button sensitive or not depending on whether a
+        # running scan is selected.
         tree_selection = self.scans_list.get_selection()
         if tree_selection is None:
             # I can't find anything in the PyGTK documentation that suggests
-            # this is possible, but we received many crash reports that indicate
-            # it is.
+            # this is possible, but we received many crash reports that
+            # indicate it is.
             model, selection = None, []
         else:
             model, selection = tree_selection.get_selected_rows()