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