Test page and python script
As requested this branch includes 'Python Script' and 'Test Page' to the migration. 3 commits:
- First includes the new portal types and adds one test for each.
- Second modifies guessExtensionOfDocument in order to be able to use content_type or reference even if the object is broken.
- Third migrates all the files existing in generic ERP5 business templates. Migration created no other diff than those files.