DDMRP Exclude Moves ADU Calc

This module extends the DDMRP buffering features so you can fine-tune which stock movements count towards a buffer's Average Daily Usage (ADU).

• On a stock location, a new checkbox "Exclude this location from ADU calculation" appears on the location form. When ticked, moves into that location are ignored when the origin location buffer computes its ADU.
• On a stock move, a new checkbox "Exclude this move from ADU calculation" appears on the move form. You can also use the "Exclude from ADU" action available on stock moves to toggle this flag in bulk. Only users in the buffer maintainer group can perform this action; others get an error.
• In stock move lists, excluded moves are shown in a muted style, and a new search filter "Not Excluded from ADU" lets you quickly find moves that are still counted.
• When you change the exclusion flag on a move, the related buffers are automatically recalculated so their ADU reflects the change.
• When you open the past ADU direct demand view from a buffer, the search filter for non-excluded moves is applied automatically, unless the calculation method uses a different source.

The module touches stock.buffer, stock.location and stock.move. It does not add new menus; the new options appear inside existing location and move screens and the move search filters.