We want to be able to persist the password file, so we can't delete it.
And since the password is now hashed and salted, we don't have to delete
it anymore.

Now that settings can be loaded from persistence, it's possible that a
setting's popover is opened without the add-setting-dialog ever being
created.

Settings are now saved to file immediately when the user changes them,
instead of before login. Beside making the code simpler, this makes it
easier to handle saving the admin password file (which we want to delete
if the user disabled the feature after loading a persistent password
file, but want to overwrite or leave untouched in other cases).

By calling chpasswd with the -e option, it uses the provided hashed and
salted password instead of hashing and salting it via PAM.

PAM uses SHA512 to hash the password, as configured in /etc/login.defs,
so in the call to mkpasswd we set --method=sha512crypt to also use SHA512.

We never call unlock() with the callback arguments, so lets remove them.

Instead of always calling update_value_label() after apply(), call it
inside apply().

This is a preparation for loading the settings in the Greeter when
persistence is unlocked.

We require to unlock the persistence via the "Unlock" button, to ensure
that the user gets some UI feedback when the persistent Greeter settings
are loaded.

The "Start Tails" is now insensitive if a password was entered in the
persistence password entry but persistence was not unlocked.

To make it easier to persist all of these settings.

Fix importing OpenPGP keys from GNOME Files

See merge request tails/tails!15

On !15, inadvertently, e6053152 + reverting it
somehow made us lose some an important improvement to this documented
workaround: namely, recommending users import keys via GNOME Files, rather than
on the command line. Given the only benefit of !15 is precisely to make
"import OpenPGP keys via GNOME Files" work, let's use this in our doc :)

refs: #17183

Upgrade to tor 0.4.3.x

See merge request tails/tails!46

This reverts commit e6053152.

Actually #17183 is not completely fixed, so the Known Issue is still
needed.

This reverts commit 61fd61f4.

No commit message

Document why some major Tails features are not packaged for Debian

Closes #6944

See merge request tails/tails!35

Update sysadmins OpenPGP key due to expiry

See merge request tails/tails!45

Buster 10.4 + Linux 5.6

See merge request tails/tails!44

Fix all branches FTBFS by bumping thunderbird apparmor patch

See merge request tails/tails!41