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)

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)

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

increment version + changelog + copyright to 2016

adding notification after an action is performed

implementing custom js

implementing various autofill javascript functions

adding autofill js file in base templates

adding js to replace diacritic char in js

fix favicon

fix unicode

begin implementing confirmation for deleting user

implementing notification to explain automatic adding of roles

adding bootstrap switch to base template

removing trailling spaces

adding basic js validation for forms

adding base template for web pages