Patch: improve core:/ resource searches

[Anthony Green]

The following patch introduces special handling for core:/ elements in
the classpath.   The old code worked, but resulted in a thrown exception
on every failed search.  Staring eclipse results in over 10k of these.

This patch sets out to avoid these exceptions and still provide the same
functionality.  Thanks to tromey for the idea.

Ok for HEAD?

AG


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