Addon: Creating a basket arch in Blender: better symmetry

A slightly improved version of the addon is available on GitHub. It corrects the slight assymetry between the left and right sides (the bottom most vertices were not at the same height)

You can install it in the usual way: File->User preferences->Addons->Intall from file. Don't forget to check the 'enable addon' box. It will the be available from the Add Mesh menu in the 3D view.
If you already installed the first version do not forget to remove the old version firs: File->User preferences->Addons->Add Mesh->Basket arch->Remove