It is exactly the same at the end but the name of the latter does not make
sense in this context. Moreover, it allows to get rid of Base import.

Make tab's right image longer so when used as background we don't see a missing border above gadget's title.

Adjust background images' color which was different one than default one and make a visual difference.

Fix "Modified wf condition to get transitions to be available even if causality state is in "draft""

- Now when a delivery is cloned and since Julien commit 5c09e2, scripts are no longer called to "start_building" and  "update_causality_state", the delivery therefore remains in draft state. Transitions that were waiting for the the delivery to be in a "solved" state were not available any longer.

this was actually "dry run"

Also minor fixes on comments and make a set of base categories for faster
lookups

* no limit instead of 1 by default.
* no listbox rendering until the dialog is updated so that we get the dialog quickly.

Supply Lines from trade conditions should not be applicable once the trade condition is invalidated / deleted

pyPdf goes in an infinite loop when PdfFileReader are created on an empty file.

BudgetCell_view is installed by erp5_budget and this bt5 is not dependency of erp5_project. Then, if erp5_project is installed Project Cell is broken.

DeliveryCell_view is more appropriated because it is installed by erp5_trade that is a erp5_project dependency