0034220: [UX] "Discounts"/"Receipt Discounts" should not be an isolated view

Description

"Discounts"/"Receipt Discounts" should not be an isolated view. Right now, when selecting a receipt line and pressing the DISCOUNTS keypad button, or going through the menu to "Receipt Discounts", a new view of the receipt is shown where multiple lines can be selected, and apply some defined discounts.

Since now it is possible to select multiple lines directly in the receipt, there is no need to perform this view 'switch', so once the DISCOUNT keypad button is pressed, the only thing that needs to change is the area in top of the keypad.

Also there are some items that are not needed anymore:
* The "Apply to all lines" field, because the "Select All" button is available in the ticket to select all the lines.
* The "Receipt Discounts" menu entry, because the discounts should be set in the same way the QUANTITY of the PRICE are set using the keypad (select the desired line(s) and press the DISCOUNT keypad button).

Steps To Reproduce

Select any receipt line and press "DISCOUNT" keypad button.

Issue History
Date Modified	Username	Field	Change
2016-10-17 13:53	dbaz	New Issue
2016-10-17 13:53	dbaz	Assigned To	=> Retail
2016-10-17 13:53	dbaz	Triggers an Emergency Pack	=> No

Relationships [ Relation Graph ] [ Dependency Graph ]

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