erp5_upgrader: Clean up XML
Revert "Add group acquisition on Computer Partition"

  This commits break testERP5Catalog

This reverts commit 61a67550f028a0c100c5c3e527c59c3c26147f78.
Update erp5_upgrader business template

- Rename some upgrader scripts
- Add upgrader script to check for table existence
- Rename some upgrade constraints
- Add upgrade constraint (table existence)
- Clean up some files
Fix LocationError when trying to access a web site with absolute url
Fix backward compatibility lost in IdTool.py