WebSearch: new refersto/citedby search operators
- Add new refersto/citedby search operators enabling to search in citation network in the second-order operator manner like:
- refersto:reportnumber:astro-ph/0302209
- refersto:author:"Ellis, J" citedby:author:witten cited:100->250
- refersto:collaboration:cms AND affiliation:mit NOT collaboration:cms
- author:ellis AND citedby:author:witten NOT refersto:author:witten (closes #276)
- Add regression tests for refersto/citedby search operators.
- Add user-level documentation sections about citation searching, for Search Tips and Search Guide pages. Other minor cosmetic updates to these documentation pages, e.g. input box width.