* gnu/installer/newt/page.scm (run-input-page)[input-hide-checkbox?]: New
parameter adding a checkbox to toggle password hiding. By default, the
checkbox is active and the password is hence hided.
* gnu/installer/newt/partition.scm (prompt-luks-passwords): Enable the
previous parameter on both password input pages.
* gnu/installer/newt/user.scm (run-root-password-page): Enable the previous
parameter,
(confirm-password): ditto,
(run-user-add-page): add a checkbox to toggle password hiding.