issue2551029: Jinja2 template install error. Issue where template's config.ini not getting updated. Change do_install in admin.py to load config_ini.ini from template before writing tracker's config.ini. This generates an updated config file for the user on install preserving values required tomake tracker work. Added config_ini.ini files to jinja2 and responsive templates to set required values (template_engine and static_files; static_files resp.). Documented new file in doc/tracker_templates.txt and added tests for new admin.py code.

<!-- dollarId: issue.item,v 1.4 2001/08/03 01:19:43 richard Exp dollar-->
<tal:block metal:use-macro="templates/page/macros/icing">
  <title metal:fill-slot="head_title">
  Item Not Found
  </title>
  <tal:block metal:fill-slot="body_title">
  Item Not Found
  </tal:block>

<td class="content" metal:fill-slot="content">
    There is no <span tal:content="context/_classname" /> with id
    <span tal:content="context/id"/>
</td>
</tal:block>