Too much precision in sp version of add_array

[Alberto Garcia]

We need this patch:
=== modified file 'Src/wxml/m_wxml_core.f90'
--- Src/wxml/m_wxml_core.f90 2016-10-20 19:24:56 +0000
+++ Src/wxml/m_wxml_core.f90 2016-12-05 08:10:22 +0000
@@ -465,7 +465,7 @@
       if (present(format)) then
          write(xf%lun,format) a
       else
- write(xf%lun,"(4(es20.12))") a
+ write(xf%lun,"(4(es20.7))") a
       endif
     end subroutine xml_AddArray_real_sp