/reviewed-on nexedi/erp5!290

/reviewed-on nexedi/erp5!287

At and From should not be title cased in "Previous Period At/From Date"
message.

By adding returned_purchase_packing_list_builder and
purchase_packing_list_builder to Alarm_buildPackingList they are used in
tested alarms.

Returned Purchase Packing List and Returned Sale Packing List can be
generated by corresponding orders.

Test are based on testOrder logic and assertions.

By adding Returned Purchase Order and Returned Sale Order it is possible
to operate with reverse logistics: return the goods sold or purchased.

@Tyagov @luke 

See the MR at slapos [here](nexedi/slapos!177).

/reviewed-on nexedi/erp5!283

this is used for file name to download

This report has always been based on "french layout", where there is first
all expenses on one page and all incomes on next page.

In the "british layout", there is only one sheet, showing income -
expense on the same layout ( as we can see today on
 https://en.wikipedia.org/wiki/Income_statement#Sample_income_statement
)

The idea is that we can configure financial section either with two
hierarchies for expense and income to have the french layout, or put all
the "british layout" hierarchy in income and leave expense empty.

(Just moving code arround to prepare next commit)

( see existing styles in Base_getODSStyleSheet )

Exchange action are meant to import/export a list of documents

https://w3c.github.io/server-timing/#the-server-timing-header-field

 ... this js was already included

Reuse code of delivery to ensure we can customize which item should be
in item table

This reverts commit 2ef67082

This allow customization, original init script is called by new script.

Performance is still not optimal, but should be better than before. At
least it does not assume that movements will be in predicate table.