[Therion] Updated Tutorial

[Footleg]

I have just put an updated draft of my Therion Tutorial online (link on the
Therion wiki), or click here: http://wscc.darkgem.com/footleg/therion/

I've completed lessons on area fills, and tackled the much more complex
topic of how to structure your data for a project which is more than one
scrap/survey trip. There are many ways to do this of course, but I have
suggested one in the tutorial which should help people who do not already
have a data model in mind. As always I welcome feedback and comments which
will help me and others to improve and learn more.

Footleg
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