Add option to view CMM calculation details to dropdown in "Articles in Stock"

[jniles]

We should add an option to the "Articles in Stock" registry to view the details of the CMM calculation. It would be call "View Calculation Details" or something similar. Here is where it would go:

Clicking this would bring up a large modal with the following information:

1. The name of the inventory item (e.g. Quinine 500mg)
2. The depot the CMM calculation is relevant for (e.g. Pharmacie PAX)
3. The time period on which the calculation is relevant. This would be the current date minus the months specified in the depot settings. It would be in the format "Time Period: ${start_date} - ${end_date}". Note that this is not the period of time we have data for. It should be the full date range derived from the depot settings.
4. The total number of items consumed that time. (e.g. 50,000 comprimes)
5. The total number of days where there were stock outs during that period. (e.g 7 jours de rupture de stock)
6. The total number of days where there was stock available (.e.g 156 jours de stock)
7. The full, written out CMM calculation, based on the algorithm chosen. For example, for the MSH algorithm, we would have:

CMM = (∑consumed_quantity / ( #month − (∑stock_out_days) / 30.5)))
CMM = (50000 / (6 − (7 / 30.5)))
CMM = 8664.773

This would allow the user to have full transparency into the way the calculation was taking place.