Details
Description
Allow for two additional GET parameters in civicrm/mailing/send URL both of which are optional:
&txtFile=
&htmlFile=
Continue to pass these to the 3rd part of the form wizard, and if they are set then populate the onscreen composition of the text file that is referenced by the txtFile var file
(path to which will always be relative to <drupal_root>/files/civicrm/upload/)
and populate html on screen composition with the file that is referenced by htmlFile var
(path to which will always be <drupal_root/files/civicrm/upload/)