[WIP] Agricultural Location and Warehouse relationships

[Tropicalrambler]

A Location needs to have an associated or linked Warehouse. Any crops or animals that is registered as present in a location, has to appear also as an item in the warehouse associated to it, to properly register accounting value.

• Add Warehouse link field to Location doctype.

• Add functionality to create a new Warehouse when creating a new Location for Agriculture module, if user does not specify an existing warehouse.

• Add a default warehouse parent for creating agricultural locations in Agriculture Settings page.