search:fix query string in add-to-search functionality

* Splits terms in Report Number field (addresses #2252)

* Adds double quotes around author filed value (closes #2251)

Signed-off-by: Adrian Pawel Baran <adrian.pawel.baran@cern.ch>
possible example `"CERN FOO 5" BAR 'BAZ 6'` -> `reportnumber:"CERN FOO 5" AND reportnumber:BAR AND reportnumber:'BAZ 6'`