SupplierPart availability (#3148)

* Adds new fields to the SupplierPart model:

- available
- availability_updated

* Allow availability_updated field to be blank

* Revert "Remove stat context variables"

This reverts commit 0989c308d0.

* Increment API version

* Adds availability information to the SupplierPart API serializer

- If the 'available' field is updated, the current date is added to the availability_updated field

* Add 'available' field to SupplierPart table

* More JS refactoring

* Add unit testing for specifying availability via the API

* Display availability data on the SupplierPart detail page

* Add ability to set 'available' quantity from the SupplierPart detail page

* Revert "Revert "Remove stat context variables""

This reverts commit 3f98037f79.

InvenTree/templates/js/translated/stock.js

@@ -1191,7 +1191,7 @@ function noResultBadge() {
 
 function formatDate(row) {
     // Function for formatting date field
-    var html = row.date;
+    var html = renderDate(row.date);
 
     if (row.user_detail) {
         html += `<span class='badge badge-right rounded-pill bg-secondary'>${row.user_detail.username}</span>`;
@@ -1707,13 +1707,13 @@ function loadStockTable(table, options) {
                 val = '# ' + row.serial;
             } else if (row.quantity != available) {
                 // Some quantity is available, show available *and* quantity
-                var ava = +parseFloat(available).toFixed(5);
-                var tot = +parseFloat(row.quantity).toFixed(5);
+                var ava = formatDecimal(available);
+                var tot = formatDecimal(row.quantity);
 
                 val = `${ava} / ${tot}`;
             } else {
                 // Format floating point numbers with this one weird trick
-                val = +parseFloat(value).toFixed(5);
+                val = formatDecimal(value);
             }
 
             var html = renderLink(val, `/stock/item/${row.pk}/`);