Several more warnings ... (#5340)

* Some more warnings removed

* Even more warnings ...

* Will it ever end? ;-)

* Avoid warning in dbstructure

* Origin and OStatus ...

* There are more warnings solved ... yeah!

* And again ...

* We are not done yet

* And more ...

* And some new places ...

* And more in the feeds

* Avoid some more

* And some backend stuff

* Notifications cleared

* Some more stuff

* and again ...

* It's getting fewer ...

* Some warnings had been hidden in the notifications

* Fix the fix

* And another missing one ...

* We need the owner here, not the user

* Forgotten user

* And more ...

* And some more warnings disappeared ...

* Some more frontend warnings

* Some backend warnings removed

* Fixed sidebar for "vier"

* And more ...

* Some more ...

* And something for "remote self"

* Am I stuck in an endless loop?

* Fix: Clear tag and file field on update

* Preset page content

mod/ping.php

@@ -278,6 +278,7 @@ function ping_init(App $a)
 		if (DBM::is_result($intros)) {
 			foreach ($intros as $intro) {
 				$notif = [
+					'id'      => 0,
 					'href'    => System::baseUrl() . '/notifications/intros/' . $intro['id'],
 					'name'    => $intro['name'],
 					'url'     => $intro['url'],
@@ -293,6 +294,7 @@ function ping_init(App $a)
 		if (DBM::is_result($mails)) {
 			foreach ($mails as $mail) {
 				$notif = [
+					'id'      => 0,
 					'href'    => System::baseUrl() . '/message/' . $mail['id'],
 					'name'    => $mail['from-name'],
 					'url'     => $mail['from-url'],
@@ -308,6 +310,7 @@ function ping_init(App $a)
 		if (DBM::is_result($regs)) {
 			foreach ($regs as $reg) {
 				$notif = [
+					'id'      => 0,
 					'href'    => System::baseUrl() . '/admin/users/',
 					'name'    => $reg['name'],
 					'url'     => $reg['url'],