BibAuthorID: fix author page query links

• Improvements for fallback solution in case:
  1. No entry in bibauthorid
  2. >1 entries in bibauthorid (future: 'did you mean' landing page)
  3. BibAuthorID not available

• URL handling improved to accept ?recid= param while still supporting <recid>:<name> passing.

• Fix links to point to a compound-exact-author-search that respects all name variants. Interim solution until author id index is instated. (closes #461)

• Fixed bad behaviour in which bibauthorid would return incompatible results. Now low-probability hits are excluded.

• Param escaping to protect from XSS attacks.

• Warning concerning 'this author is not on this paper' case.