Revert "Add notes to Qpsmtpd::Address class"

This reverts commit ea86b9fdb2.

Jared said...
I originally considered these functionally identical, but they are
not. The new code, called with, say, $txn->notes('discard',undef),
would result in evaluation as if it were a 'get' method rather than
setting the 'discard' note to undef.  That seems quite dangerous.  I
suggest either reverting the language back to the '@_ and' model, or
else doing something like:

lib/Qpsmtpd/Address.pm

@@ -317,20 +317,6 @@ sub host {
     return $self->{_host};
 }
 
-=head2 notes($key[,$value])
-
-Get or set a note on the recipient. This is a piece of data that you wish
-to attach to the recipient and read somewhere else. For example you can
-use this to pass data between plugins.
-
-=cut
-
-sub notes {
-  my ($self,$key,$value) = @_;
-  $self->{_notes}->{$key} = $value if defined $value;
-  return $self->{_notes}->{$key};
-}
-
 sub _addr_cmp {
     require UNIVERSAL;
     my ($left, $right, $swap) = @_;

lib/Qpsmtpd/Connection.pm

@@ -108,9 +108,10 @@ sub hello_host {
 }
 
 sub notes {
-  my ($self,$key,$value) = @_;
-  $self->{_notes}->{$key} = $value if defined $value;
-  return $self->{_notes}->{$key};
+  my $self = shift;
+  my $key  = shift;
+  @_ and $self->{_notes}->{$key} = shift;
+  $self->{_notes}->{$key};
 }
 
 sub reset {
@@ -199,9 +200,7 @@ set after a successful return from those hooks.
 
 =head2 notes($key [, $value])
 
-Get or set a note on the transaction. This is a piece of data that you wish
-to attach to the transaction and read somewhere else. For example you can
-use this to pass data between plugins.
+Connection-wide notes, used for passing data between plugins.
 
 =head2 clone([%args])
 

lib/Qpsmtpd/Transaction.pm

@@ -55,9 +55,11 @@ sub header {
 #}
 
 sub notes {
-  my ($self,$key,$value) = @_;
-  $self->{_notes}->{$key} = $value if defined $value;
-  return $self->{_notes}->{$key};
+  my $self = shift;
+  my $key  = shift;
+  @_ and $self->{_notes}->{$key} = shift;
+  #warn Data::Dumper->Dump([\$self->{_notes}], [qw(notes)]);
+  $self->{_notes}->{$key};
 }
 
 sub set_body_start {