Cleanup harvester exceptions and generics.
remove httpclient 3.1 and custom-built httpclient.jarrework MetacatClient (and other classes) to use httpclient 4updated build to not create httpclient.jarencoding tests now pass.
blank configuration value should be treated the same as null
few bug fixes for listObjects
added code to do database query for listObjects
Cleaned up unused imports.
pass the root exception message up the call chain so that it can effectively be reported as a helpful error message. also, the JUnit test expects the specific error message (SchemaRegistryTest)
adding fields for additional system metadata info
use the read() method instead of manually calling with parameters
some new code for debugging mmp
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