[Tryton] product kit .. extra logic for components when expanded on sale quotation

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Since Tryton 6.0 had the awesome product kit module added I saved a lot of time and only had to add some custom logic for my extra fields.

After some discussion on the IRC channel I had a vague idea of what to do (write my own get_components was up for discussion,..)

In the end I found a really simple way to do what I wanted after playing around in proteus a bit and inspecting the data. Basically I am making use of <prefix>line.component_children.

Since the components of a kit are expanded on quotation I just added one more method to my customized Sale class:

   @classmethod
@ModelView.button
@Workflow.transition('quotation')
@set_employee('quoted_by')
def quote(cls, sales):
super(Sale, cls).quote(sales)
# we need to apply folder_no to components of kits
for sale in sales:
for line in sale.lines:
for lc in line.component_children:
lc.folder_no = line.folder_no
lc.save()
cls.save(sales)

I am not 100% sure if the last cls.save(sales) is needed, but I thought rather be safe than sorry. Now my components have the same folder_no as the kits which is needed for my project documentation.

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