Squashed commit of the following:

commit d596dd6b92c2f5435794518ed2108877f4fceadd
Author: Steve Frécinaux <code@istique.net>
Date:   Sun Jul 29 19:25:08 2007 +0200

    Changelog entry

commit 4bdfba19aea3c8432a59b54163b1b787d62aea16
Author: Steve Frécinaux <code@istique.net>
Date:   Sun Jul 29 16:15:19 2007 +0200

    Split Saver #7

    - mtime is an argument for _save()
    - flags is a property of the saver

    Rationale: flags is a property of the saving operation, while
               mtime is not.

commit c258e85d8c7f4aa77d6557623292d43143d85d51
Author: Steve Frécinaux <code@istique.net>
Date:   Sun Jul 29 16:13:20 2007 +0200

    Make "flags" a property

commit 727974398df281898e8174c30b0facd5da6d8fc4
Author: Steve Frécinaux <code@istique.net>
Date:   Sun Jul 29 16:05:01 2007 +0200

    Add back the mtime argument to save()

commit e433bc3e7ce1b5a8ac52998b46205ef49026a7c3
Author: Steve Frécinaux <code@istique.net>
Da...