Note: Message catalog should be tweaked.

- 4 spaces indentation
- Indent on HTML tags AND on TT2 stuff ([% IF … %])
- Avoid HTML or TT2 oneliners like:
```
  [% IF top_menu %]…[% END %]
  <div class="displayNone"><a href="#top">Top of Page</a></div>
```
- When a tag has too many attributes to be on one line, indent the
  attributes at the same level than the first one:
```
<label class="foo"
       id="bar">
    Baz
</label>
```

Updating source texts according to fixes on en_US catalog

Refactoring on mail templates

Reset WWSympa's session when SSO session refreshed (#560)

  - Use "[% string | loc %]" instead of "[%|loc%]string[%END%]".
  - Use a filter "mailbox".

Updating source texts according to fixes on en_US catalog

Refactor Sympa::Scenario (cf. #520)

Crash with broken S/MIME user certificate (cf. #565)

import.tt2: non-working line break in toolip (#562)

sympa_test_ldap.pl misses bind password

Test-PerlTidy 20190305.001 requires later version of Perl::Tidy which may break the past formatting.  As a workaround, force sticked version of Test::PerlTidy.

Replace Sympa::List::load_list_of_scenarios() with Sympa::Scenario::get_scenarios().

Other cleanup of code.