WebSearch: field-filtered MARCXML API output
- Implements field-filtered MARCXML output in Python and Web APIs. This was working for the TextMARC output, not for MARCXML output. This commit fixes the problem. Usage: /record/123?of=xm&ot=100,700 or /search?p=ellis&of=xm&ot=100,700. (closes #1591)
- Adds new tests for trying to access hidden fields via the filtered-field API technique.
Signed-off-by: Tibor Simko <tibor.simko@cern.ch>