More complex pricing calculations

- Calculate BOM price for a part
- Calculate total pricing for a part (build or purchase)
- Display pricing information in BOM table

InvenTree/part/templates/part/bom.html

@@ -11,6 +11,14 @@
 
 <h3>Bill of Materials</h3>
 
+{% if part.has_complete_bom_pricing == False %}
+<div class='alert alert-block alert-warning'>
+    The BOM for <i>{{ part.full_name }}</i> does not have complete pricing information
+</div>
+{% endif %}
+<div class='panel panel-default'>
+    Single BOM Price: {{ part.min_bom_price }} to {{ part.max_bom_price }}
+</div>
 {% if part.bom_checked_date %}
 {% if part.is_bom_valid %}
 <div class='alert alert-block alert-info'>