Make all int -> Real casts explicit

lily/page-layout-problem.cc

 /*
   This file is part of LilyPond, the GNU music typesetter.
 
   Copyright (C) 2009--2020 Joe Neeman <joeneeman@gmail.com>
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
 
@@ skipping 717 matching lines @@
       Real overflow = spacer.configuration_length (spacer.force ())
                       - page_height_;
       if (ragged && overflow < 1e-6)
         warning (_ ("ragged-bottom was specified, but page must be compressed"));
       else
         {
           warning (_f ("compressing over-full page by %.1f staff-spaces",
                        overflow));
           force_ = -infinity_f;
           vsize space_count = solution_.size ();
-          Real spacing_increment = overflow / Real (space_count - 2);
+          Real spacing_increment
+              = overflow / static_cast<Real> (space_count - 2);

[Dan Eble, 2020/02/02 18:44:51]

This isn't an issue with this change, but does anyone see whether something
prevents division by zero here?  It isn't immediately obvious to me.

           for (vsize i = 2; i < space_count; i++)
-            solution_[i] -= Real (i - 1) * spacing_increment;
+            solution_[i] -= static_cast<Real> (i - 1) * spacing_increment;
         }
     }
 }
 
 Real
 Page_layout_problem::force () const
 {
   return force_;
 }
 
@@ skipping 488 matching lines @@
     {
       if (has_interface<Hara_kiri_group_spanner> (input[i]))
         Hara_kiri_group_spanner::consider_suicide (input[i]);
 
       if (input[i]->is_live ())
         output.push_back (input[i]);
     }
 
   return output;
 }