add dtml file for trash and template tools

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4950 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/dtml/explainTemplateTool.dtml

+<dtml-var manage_page_header>
+<dtml-var manage_tabs>
+
+<p>TemplateTool provide an interface to manage Business Templates.</p>
+
+<dtml-var manage_page_footer>

product/ERP5/dtml/explainTrashTool.dtml

+<dtml-var manage_page_header>
+<dtml-var manage_tabs>
+
+<p>TrashTool keep a collection of trash bins wich hold all backup
+objects from installation of Business Template.</p>
+
+<dtml-var manage_page_footer>