jsonalchemy: dumps with specified keywords

* Adds an option to dump only specified keys from dictionary.

Signed-off-by: Leonardo Rossi <leonardo.r@cern.ch>
Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
search: fix filtered output format

* Addresses issue with research and export that not accept the "ot"
  filter argument.  (closes #2292)

Signed-off-by: Leonardo Rossi <leonardo.r@cern.ch>
Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
principal: raise 401 on authorization failure

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
search: fix query string in add-to-search

* Adds double quotes around author and title value. (closes #2251)

* Splits terms by whitespace or quotes and join them
  with proper operator. (addresses #2252)

Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Signed-off-by: Adrian Pawel Baran <adrian.pawel.baran@cern.ch>