Location of lasagna during loading is no longer correct

[raacampbell]

Since changing to the new system of installing Lasagna in the system path, the line of code that finds where Lasagna is located is not helpful. This is in lasagna_object on roughly line 184:

        lasagna_path = os.path.dirname(os.path.realpath(sys.argv[0]))

It therefore looks for IO loaders in /usr/local/bin or whatever by default.
This issue is related to #223.

[raacampbell]

Fixed: 7d0fc3a