lots of code, some progress

I spent the evening working on add section. One change to the API is that we'll use chained methods for headline and for exports. And for set too when I get to it. This will greatly simplify the API.

The one line in sample1 where we create a well known rolon now reads:

addWellKnownRolon("myRolon").setHeadline("...").exportPathname("context");

Tomorrow I plan on working on adding entities as well as sample2. After that I expect the pace to pick up.

I've also been careful about the javadocs for the DRM (Document Rolon Model), as that is the bulk of the API which will be used. (Unless you're making extensions, of course. But that's probably the easyest part.)