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>
Are you doing this only for `reportnumber` field?  That would not be enough, note that *most* fields (except author, see #2251, and journal which has more input boxes) would have this problem.  I used `reportnumber` only as an example in #2252; e.g. try `keyword` field.

So please generalise it to all fields modulo author field. Ideally, we should make the behaviour easily configurable, so that each site can choose wanted matching when they will be customising the add-to-search form by adding their local new fields, say.