fixed default facets for depended "java" projects
* only "fixed" facets are senseless as they have no effect at all
* "jst.web" and "jst.utility" are not allowed together
* "jst.utility" requires "jst.java"
improved and centralized documentation for Eclipse WTP Facets assertions
Merge branch 'eclipse-wtp.default.facets.for.java.projects' of github.com:aaschmid/gradle into aaschmid-eclipse-wtp.default.facets.for.java.projects1
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