Hello,

When cloning a bug that has multiple bugnotes attached to it, the dates on all attached bugnotes
are overwritten by the current timestamp.

I saw in IssueAddCommand.php that here no date is passed to the bugnote_add function.
My suggestion in IssueAddCommand.php :
bugnote_add(
$t_issue_id,
$t_parent_bugnote->note,
$t_parent_bugnote->time_tracking,
$t_private,
$t_parent_bugnote->note_type,
$t_parent_bugnote->note_attr,
$t_parent_bugnote->reporter_id,
false,
$t_parent_bugnote->date_submitted, # <-- add date here instead of 0
$t_parent_bugnote->last_modified, # <-- add date here instead of 0
false );

What do you think about it? I am writing this because the bugnotes change their order when cloning.
I can make a PR for this if you think this is a good idea. :)

Btw thanks for the great bugtracker!