Reference docs (#308)

* Add information on build order reference

* Add reference field description for purchase order

* Add reference information for SalesOrder

* Updated images for build orders

* Update settings information

* Add note regarding python string formatting

* Add some more screenshots

* Improved BOM documentation

* Improve BOM documentation further

* Split  "BOM Export" onto separate page

* Rearrange docs pages

* Add image to fill TODO entry

* Split out part scheduling page

docs/build/bom_export.md

@@ -0,0 +1,44 @@
+---
+title: BOM Export
+---
+
+## Exporting BOM Data
+
+
+BOM data can be exported for any given assembly by selecting the *Export BOM* action from the BOM actions menu.
+
+You will be presented with the *Export BOM* options dialog, shown below:
+
+{% with id="bom_export", url="build/bom_export.png", description="Export BOM Data" %}
+{% include 'img.html' %}
+{% endwith %}
+
+### BOM Export Options
+
+**Format**
+
+Select the file format for the exported BOM data
+
+**Multi Level BOM**
+
+If selected, BOM data will be included for any subassemblies. If not selected, only top level (flat) BOM data will be exported.
+
+**Levels**
+
+Define the maximum level of data to export for subassemblies. If set to zero, all levels of subassembly data will be exported.
+
+**Include Parameter Data**
+
+Include part parameter data in the exported dataset.
+
+**Include Stock Data**
+
+Include part stock level information in the exported dataset.
+
+**Include Manufacturer Data**
+
+Include part manufacturer information in the exported dataset.
+
+**Include Supplier Data**
+
+Include part supplier information in the exported dataset.