Bug 5691 - Delete all items respects independentbranches system preferences

Bug 5691 - Delete all items respects independentbranches system preferences

Squashed commit of the following:

commit 66cdb8804136803a3f626d183c8f192f61f3c7b1
Author: Chris Cormack <chrisc@catalyst.net.nz>
Date:   Fri Feb 4 12:55:10 2011 +1300

    Bug 5691: Updating copyright statement

commit 79ef6c269afc9c644c51709a7657542a0fc6d7d6
Author: Chris Cormack <chrisc@catalyst.net.nz>
Date:   Fri Feb 4 12:52:13 2011 +1300

    Bug 5691 - Fixing a syntax error and tidying up some formatting

commit a66485dba113c05ed51a3b4ff19f788e335aa1f6
Author: Henri-Damien LAURENT <henridamien.laurent@biblibre.com>
Date:   Tue Oct 5 17:23:55 2010 +0200

    (MT #1365) Delete all items

    Using DelItemCheck in cataloguing/additem.pl
    when deleting all items

commit fe845fd48ab22ff82ad6d8971c468c327b49f3c4
Author: Christophe Croullebois <christophe.croullebois@biblibre.com>
Date:   Wed Sep 22 11:39:28 2010 +0200

    (MT #1365) Delete all items

    Now if IndependantBranches is on and a user try to delete all items, only the items of his branch will be deleted.
    A message explain this fact.

Signed-off-by: Chris Nighswonger <cnighswonger@foundations.edu>
Followup: (MT #1365) Fixing up the English idiom
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>