[Patch] modifiedselector, style, remove unused code, slightly more lazy DigestAlgorithm.getValue

[Kev Jackson]

- removed iterator code fromModifiedSelector
- lazier DigestAlgorithm.getValue (includes JUnit test)
- removed unncecessary nesting in EqualsComparator
      //
       // -----  Instantiate the interfaces  -----
       //
       String className = null;
       String pkg = 
"org.apache.tools.ant.types.selectors.modifiedselector";

what do these lines do in ModifiedSelector.configure?  Eclipse says that 
they're never read, and as they're method variables, not class or 
instance variables (ie not public), I was very tempted to delete them, 
but I thought I'd better ask first in case they're present to support 
future functionality

Kev
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