[TYPO3-core] RFC: Another hook request for db_list (#6738)

[Tapio Markula]

Bernhard Kraft
> I read your mail in the dev-list about Web>List Top-Icons.
thank's.
The hook proposal was just hook in the same place where 
'a21belistbutton' has definition of new icon inside the function 
'writeTop($row)'.

> There are 3 kinds of control elements at Web>List in the very top

I was confused two arrays
* $theCtrlPanel[]
* $theData['up'][]
which  made reordering impossible.