Keywords List in Appendix D.2

[tajmone]

While working on the keywords list in Appendix D.2, I've noticed a couple of things:

• The built-in classes actor and location are present, but not thing, entity and object. Is it because the former are also pseudo-attributes and the latter not?
• Some keywords like Container, Opaque, on, off, etc. could be seen more like the built-in classes (ie, built-in pseudo attributes, as they at times called in the Manual). How should we case these? lowercase, like built-in classes?

I've converted the original verbatim-styled block to a CVS-Table — IMO it looks nicer, and it's also easier to maintain, and the number of columns could be controlled via custom attributes, and be set differently in different formats (eg, for an ePub in an ebook reader 4 columns instad of 5 might be better).

[tajmone]

These issue where discussed and resolved in #15 and #17.