cleanup distribution assembly

The xxx-distr projects "src" distributions are only excluding the /target; they should exclude other files, such as the Eclipse .classpath, .settings, etc.

The xxx-distr projects, when they build their javadocs, have the "id" of that step misspelled - it should match the spelling in the parent-pom-top in order to inherit the settings there (those settings turn off a bunch of noisy warnings that would otherwise completely obscure any real issues).