[Typo3] Clean up unused data in database

[tapio]

Robert Lemke wrote:
> Hi Dieter et al,
> 
> Kasper will work on some new cleanup functions and an integrity check for
> the TYPO3 database. It will surely have a little module which lets you do a
> nice spring cleaning.

That's fine. Now itt seems that the compare tools checks *only* against 
installed plugins. Some core files might use them also.
If tables and field has been dropped on the base of extension 
ext_tables.sql files but some core files need them, in this case the 
result is incorrect.

Simple solution. The compare tool should use also a list of tables and 
related fields, which are use by core files. Those tables and fields 
should *never* drop. This list could be hanled like a hidden extension,
when the mechnism would not need radically change.


> The new functions are planned to be part of TYPO3 4.0. 

Could it be also as an extension for Typo 3.8.x - it would be safer to 
use 3.8.1 than 4.0.