Fix for list.sort requiring keywords in python3.5

Python3.5 changed the parameters in list.sort to be keyword only
arguments.

This fixes all the instances I could find.

wx/lib/agw/ribbon/bar.py

@@ -766,7 +766,7 @@ class RibbonBar(RibbonControl):
                         # Sneaky obj array trickery to not copy the tab descriptors
                         sorted_pages.append(info)
 
-                    sorted_pages.sort(self.OrderPageTabInfoBySmallWidthAsc)
+                    sorted_pages.sort(key=self.OrderPageTabInfoBySmallWidthAsc)
                     width -= tabsep*(numtabs - 1)
 
                     for i, info in enumerate(self._pages):

wx/lib/agw/ultimatelistctrl.py

@@ -10406,7 +10406,7 @@ class UltimateListMainWindow(wx.ScrolledWindow):
         else:
             self.__func = func
 
-        self._lines.sort(self.OnCompareItems)
+        self._lines.sort(key=self.OnCompareItems)
 
         if self.IsShownOnScreen():
             self._dirty = True

wx/lib/docview.py

@@ -2219,7 +2219,7 @@ class DocManager(wx.EvtHandler):
         if sort:
             def tempcmp(a, b):
                 return cmp(a.GetDescription(), b.GetDescription())
-            templates.sort(tempcmp)
+            templates.sort(key=tempcmp)
 
         strings = []
         for temp in templates:
@@ -2259,7 +2259,7 @@ class DocManager(wx.EvtHandler):
         if sort:
             def tempcmp(a, b):
                 return cmp(a.GetViewTypeName(), b.GetViewTypeName())
-            templates.sort(tempcmp)
+            templates.sort(key=tempcmp)
 
         res = wx.GetSingleChoiceIndex(_("Select a document view:"),
                                       _("Views"),

wx/py/shell.py

@@ -755,7 +755,7 @@ class Shell(editwindow.EditWindow):
         #sort lowercase
         def _cmp(a,b):
             return  ((a > b) - (a < b))
-        unlist.sort(lambda a, b: _cmp(a.lower(), b.lower()))
+        unlist.sort(key=lambda a, b: _cmp(a.lower(), b.lower()))
 
         #this is more convenient, isn't it?
         self.AutoCompSetIgnoreCase(True)

wx/py/sliceshell.py

@@ -2140,7 +2140,7 @@ class SlicesShell(editwindow.EditWindow):
         unlist = [thlist[i] for i in xrange(len(thlist)) if thlist[i] not in thlist[:i]]
 
         #sort lowercase
-        unlist.sort(lambda a, b: cmp(a.lower(), b.lower()))
+        unlist.sort(key=lambda a, b: cmp(a.lower(), b.lower()))
 
         #this is more convenient, isn't it?
         self.AutoCompSetIgnoreCase(True)