WWSympa: Loading home page takes long time

WWSympa: Older CSS files would be cleared

Allow to use Gitlab CI

Avoid two-args open and bareword filehandle. Ignore errors.

Fix #301 — Add global mail signature feature

When user is logged-in, Sympa collects information about membership/adminship among all lists, content of moderation spool and so on, though they will never be used.  Fixed by removing code collectiong information in vain. Deprecated web_tt2/news.tt2.

For those who prefer to work on Gitlab (or use Gitlab CI while using
Github[1]), here's a working .gitlab-ci.yml.

Docker images for the CI are published on
https://framagit.org/luc/DockerFiles/tree/master/sympa-perl

[1] See https://about.gitlab.com/solutions/github/

Fixed by clearing older style.css* and lang.css* under $CSSDIR when they would be updated.

Note: Among files under $CSSDIR, fullPage.css*, print.css* and print-preview.css* will no longer be used nor updated. These may be removed manuallly.

Additional fix for #474.

Prevent warning on undefined salt variable.

Crash in create_list_request when list name is missing #490

Additional changes for #492

Add token to prevent CSRF.

Add a etc/mail_tt2/message.global_footer or
etc/mail_tt2/message.global_footer.mime file and it will be added to all
messages.
Obviously, only admins can edit that file.
It can be used to add an unsubscribe link while letting users add their
own list signature.

(This probably makes responses a bit slower.)

Updating source texts according to fixes on en_US catalog

Fix shared docs zip upload to send multiple files at once

Broken `custom_attribute` field in `member.dump`

Fix missing quotes in init script

Datasource: On LDAP 2 level query, attr1 as DN should not be canonicalized

On Debian 9, with perl 5.24.1 and Archive::Zip 1.59 and 1.64, uploading
a zip file to let Sympa (6.2.34) unzip it and put its files into shared
docs fails.
The zip member is a CGI::File::Temp instance and can seek but fails to
be extracted ("Unable to extract member XXX of the zip file" in Sympa
logs).
Unconditionnally blessing the file handle to IO::File fixes the failure.