[SUBMIT] Digester ExtendedBaseRules

[robert burrell donkin]

here's the extension to the RulesBase matching rules that i've been 
threatening for a while now.

there are (probably too verbose) java doc comments for the class 
explaining it so i'll (try to) be brief here.

basically, this is a logical superset of the RulesBase matching rules - 
that is, it has extra patterns but existing patterns should run the same. 
the extra kinds of rule allow the creation of smaller, more maintainable 
rulesets for complex schema. to prove this, the test case extends the 
RulesBase test case.

- robert

EBRTestCase.java

ExtendedBaseRules.java