Ezigrade 4.13

Have added in and improved functions to create contour banks. Contour banks are added in for erosion control. It creates smaller runs for the water; thus reducing velocity.

We can now specify an alignment and hang contour banks left and right at appropriate distances or heights. These contour banks are created as drains/banks so existing drain functions can be used to edit and tweak the final design.

Access for the new banks menu item.