fix the urls for modify and delete ...

The id of the user is passed through the querystring in this page.
But the id was not properly escaped to be included as a querystring
parameter leading to weird issues like.

cleanup in html template + tidylib ...

* few small cleanup in html template (avoid empty tbody, put id between
quotes)
* switch to tidylib to validate the html instead of the previous hack
calling an external service (https://html5.validator.nu/)
* remove the previous validator script
* add exception for tidylib on empty <span> (these are required by
bootstrap)

switch to using lists in templates ...

Sets are not available in mako templates when using python3.
Reverting to using lists with 'if not in' checks to avoid duplication.

fix template over-escaping + python 3 support ...

The templates were html escaping the generated js code for the
autofill and the role management. This was breaking these features.
It's okay to not escape these as they are coming from a trusted source
(configuration file).

Also make the templates python3 compatible (not need to import Set in
python 3)

Escape form values with markupsafe ...

- Use markupsafe to format escaped HTML fragments
- Correct the formatting problems introduced with the XSS fixes

Protect against XSS vulnerabilities in URL redirection ...

- Switch from base64 to URL encoding for the passing the URL, using the built-in Mako filtering
- Apply HTML filtering to Mako output by default
- Disable HTML filtering for nested templates in adduser, modify, and selfmodify

hack to have a cleaner resize

removing duplicate option in form select fields

add dynamic resizing to align input-group-addon ...

* add class to identify the 2 form columns
* add a js that calculate max width and resize all input-group-addon
spans
* load the js in the base template

adding textarea

admin search if admin in navbar ...

Now LdapCherry Administrator are displayed the searchadmin page
(the one displaying the modify and remove buttons) when they use
the navbar search.

add ldapcherry icon in navbar linked to /

focus on first field for all forms ...

previously, only the add form had focus on first field. Now every form
(add, modifify, selfmodify) have focus on first field.

disable min search lenght for admin search

fix many error with html unescaped attributes

bolding the user's attributes

change the display form of the user's attributes

implement the display of users attributes on index page

add a default handler for 404 requests

force focus on the first input of forms

properly implementing minimum lenght limit in search

grotesque hacks to disable firefox autofilling of the forms

increment version + changelog + copyright to 2016

adding a little js for min lenght search ...

* impose a min lenght of 3 chars on searches, at least on the client
side...

implementing default value in form

modifying the templates to include custom ppolicy error message

adding notification after an action is performed

implementing custom js

multiple modification/fix ...

* add display_name parameter for backend
* handle display_name in modify template (lonely groups) and error
  message
* fix bug in modify when user is in only one backend
* remove redondant exception in ad/ldap backend
* fix unit test accordingly
* fix License in AD backend (GPLv3 -> MIT, previously tought of using
  samba4 python library which is GPL, but this module finaly uses
  python-ldap which is MIT compatible)

adding global exception handler