[tei-council] Class mods

[Lou Burnard]

As mentioned a few days ago, I am in the process of revising chapter ST, 
which turns out to need quite a lot of work. My main objective is to 
make sure that all classes are documented clearly and in a uniform way, 
either in this chapter or that for the relevant module. I will report 
further when I have finished this (I hope in a day or so).

Regrettably, I'm finding it necessary to make a small number of 
modifications in the interests of coherence and consistency. I will try 
to log these as they come up (they are also visible in SF of course). 
Main changes today are:

* I have renamed the classes model.complexVal and model.singleVal to 
model.featureVal.complex and model.featureVal.single respectively.

* I have removed redundant classes model.assertLike and model.blockLike.

* I have made model.egLike a member of model.inter (rather than 
model.phrase), and removed explicit membership in model.common for <eg> 
and <egXML>

I have tested all these changes against the test suite, as usual, of 
course, but if you have stuff you can easily check, please do so!