Update timeline sidebar content.
Display discounts, fees and credit notes in order process.
Improve addresses display on order process.
Update admin styles:
 - make document-list markup usable outside from a real document list
 - fix styles of panels
Move "concerned product" block to the top of aside column in variant group editor.
Add isPropertyModified() method on editors.
Update order editor:
 - the order is now editable only if the processingStatus is "edition"
 - add buttons to switch between "edition" and "processing" statuses
 - homogenize line adding
 - don't use a document list for lines (they are not documents) but use the same markup
 - show discounts and fees in total
 - some other fixes and visual enhancements
Popin template is not mailSuitable.
Merge pull request #890 from intportg/dev

Discount, fees and credit notes in order process + admin order editor update + misc fixes