Small fixes to ZODB history tab
Assorted fixes for minor issues with ZODB History tab:
- When viewing history of a website or websection in the "backoffice" interface, clicking on View ZODB History does not keep the
ignore_layout:int=1request parameter that forces displaying the forms in the View skin selection.
- Fix using ZODB history for documents with binary properties, such as
dataproperty on images and files. Instead of failing with unicode error, just display "(binary)".
- Put the link field in center group, forms with only fields in left group and nothing in right group have a border only on the left side. ( this is https://www.erp5.com/documentation/developer/guideline/module/erp5-Guideline.Module.Creation/#listbox-only-tabs-should-have-a-read-only-title-in-center-group )