Anim Editors: "View Frame" Operator - Code Cleanups/Reshuffling + NLA/Timeline Support

* Reshuffled code for existing "View Frame" implementations, and removed leftover
  comment from some of the the copy-and-paste used to build it.
* Added support for this operator in the NLA and Timeline

release/scripts/startup/bl_ui/space_nla.py

@@ -86,6 +86,7 @@ class NLA_MT_view(Menu):
         layout.separator()
         layout.operator("nla.view_all")
         layout.operator("nla.view_selected")
+        layout.operator("nla.view_frame")
 
         layout.separator()
         layout.operator("screen.area_dupli")

release/scripts/startup/bl_ui/space_time.py

@@ -130,7 +130,6 @@ class TIME_MT_view(Menu):
 
         layout.prop(st, "show_seconds")
         layout.prop(st, "show_locked_time")
-        layout.operator("time.view_all")
 
         layout.separator()
 
@@ -143,6 +142,11 @@ class TIME_MT_view(Menu):
 
         layout.separator()
 
+        layout.operator("time.view_all")
+        layout.operator("time.view_frame")
+
+        layout.separator()
+
         layout.operator("marker.camera_bind")
 
         layout.separator()