code cleanup in multiple files

Last changes were merged quickly without strict code-review
as it was needed to integrate them promptly.
Related modifications:
 * callwidget.cpp: Removed unnecessary line feed
 * callwidget.{cpp,ui}: Renamed “contactRequestView” to
   “contactRequestPage” for consistency
 * contactrequestwidget.cpp: Refactoring of a too-long line
 * sendcontactrequestwidget.{cpp,ui}: Better placeholders

Moreover, contactrequestwidget.{cpp,ui} were missing the GPL
header and copyrights' years are now updated to 2017 in every
files.

Change-Id: Id52f340fc62340df6cf5bda8d782fefc732beabe
diff --git a/accountserializationadapter.h b/accountserializationadapter.h
index e6b67c2..d4acfbd 100644
--- a/accountserializationadapter.h
+++ b/accountserializationadapter.h
@@ -1,5 +1,5 @@
 /***************************************************************************
- *   Copyright (C) 2015-2016 by Savoir-faire Linux                              *
+ *   Copyright (C) 2015-2017 by Savoir-faire Linux                              *
  *   Author : Emmanuel Lepage Vallee <emmanuel.lepage@savoirfairelinux.com>*
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *