Status update: Loyc tree rewritten

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I have made and implemented the changes that I planned to make to the Loyc tree. The code was rewritten from scratch; the new code is not as fancy or complete, but it's easier to use. During the redesign I decided on some small changes to the representation of certain expressions in EC#: LLLPG is also improved; I have implemented two more major features: Only two major features are left and LLLPG 1.0 will be ready: