Added the ability for a user to change his email address.

The change is not performed immediately. First a confirmation email is
sent to the user and if validated, the email address is changed.

src/IDF/templates/idf/user/changeemail-email.txt

@@ -0,0 +1,22 @@
+{blocktrans}Hello {$user},
+
+To confirm that you want {$email}
+to be your new email address, just follow this link:
+
+{$url}
+
+Alternatively, go to this page:
+
+{$urlik}
+
+and provide the following verification key:
+
+{$key}
+
+If you do not want to change your email address, 
+just ignore this message.
+
+Yours faithfully,
+The development team.
+{/blocktrans}
+

src/IDF/templates/idf/user/changeemail.html

@@ -0,0 +1,39 @@
+{extends "idf/base-simple.html"}
+{block body}
+{if $form.errors}
+<div class="px-message-error">
+<p>{trans 'Oups, we found an error in the form.'}</p>
+{if $form.get_top_errors}
+{$form.render_top_errors|unsafe}
+{/if}
+</div>
+{/if}
+
+<form method="post" action=".">
+<table class="form" summary="">
+<tr>
+<td>&nbsp;</td>
+<td><strong>{$form.f.key.labelTag}:</strong><br />
+{if $form.f.key.errors}{$form.f.key.fieldErrors}{/if}
+{$form.f.key|unsafe}
+</td>
+</tr>
+<tr>
+<td>&nbsp;</td>
+<td><input type="submit" value="{trans 'Confirm Your New Email Address'}" name="submit" /> | <a href="{url 'IDF_Views_User::myAccount'}">{trans 'Cancel'}</a>
+</td>
+</tr>
+</table>
+</form>
+{/block}
+{block context}
+<div class="issue-submit-info">
+<h2>{trans 'Instructions'}</h2>
+<p>{trans 'Use your email software to read your emails and open your verification email. Either click directly on the verification link or copy/paste the verification key in the box and submit the form.'}</p>
+</div>
+{/block}
+{block javascript}<script type="text/javascript">
+document.getElementById('id_key').focus()
+</script>
+{/block}
+

src/IDF/templates/idf/user/myaccount.html

@@ -28,6 +28,13 @@
 </td>
 </tr>
 <tr>
+<th><strong>{$form.f.email.labelTag}:</strong></th>
+<td>{if $form.f.email.errors}{$form.f.email.fieldErrors}{/if}
+{$form.f.email|unsafe}<br />
+<span class="helptext">{$form.f.email.help_text}</span>
+</td>
+</tr>
+<tr>
 <th>{$form.f.language.labelTag}:</th>
 <td>{if $form.f.language.errors}{$form.f.language.fieldErrors}{/if}
 {$form.f.language|unsafe}