Don't expose NCS url in the atom response.
Refactored record post-processor.

Now post-processor, when configured in config.ini, is loaded by NCSRecord class
(where it gets used) instead of loaded externally and passed to the class instance.
Forgot to add NCSRecord class in last commit.
Also forgot to add updated version of SchemaNCSCow in last commit.
Fixed NCSRecord trying to post-process record when no post-processor was defined.
Added new route to handle /record/<record-id> URLs.
Little bit of code cleanup in NCSRecord class.