dev#160166 : CkEditor placeholders plugin

This plugin adds 2 buttons (records and articles) that print a corresponding placeholder. [newsletter_records] is replaced with biblio records linked to the newsletter. [newsletter_articles] is replaced with articles linked to the newsletter.

tests/application/modules/admin/controllers/newsletter_placeholder_content_expected.html

@@ -3,4 +3,4 @@
 <div style="padding:5px"><a href="http://localhost/html/recherche/viewnotice/clef/MARTINEALAPLAGE/id/42">Martine à la plage</a><div></div><div style="clear:both"></div></div>
 Middle
 <div style="padding:5px"><h1>Le Roi des cons</h1><div>Il est beau, il est fier sur son throne.</div><div style="clear:both"></div></div><div style="padding:5px"><h1>70 millions …</h1><div>Ils sont 70 millions prêts à prendre sa place.</div><div style="clear:both"></div></div><div style="padding:5px"><h1>Gilets Jaunes</h1><div><a href="http://localhost/html/viewarticle/gilets-jaunes"> La révolution a commencé.<img src='http://localhost/html/userfiles/jaunes.gif' /> . <img SRC="http://localhost/html/userfiles/gilets.gif" /></a><a href="http://lienexterne/maquereau"><img src='http://imageexterne/maquereau.gif' /></a></div><div style="clear:both"></div></div><div style="padding:5px"><h1>L'arnaque</h1><div>La révolution a oublié de décapiter la misère et l'exploitation.</div><div style="clear:both"></div></div>
-footer<br/><a href="http://localhost/html/newsletter/unsubscribe/newsletter/3/user//hash/6dd28e9b">
\ No newline at end of file
+footer<br/><a href="http://localhost/html/newsletter/unsubscribe/newsletter/3/user//hash/6dd28e9b"
\ No newline at end of file