aps_package: various fixes

* Fixes affiliation harvesting.

* Adds the page range after pp in unstructered text.

* Uses subfield 't' instead of 'q' for book titles.

* Fixes the year harvesting.

Signed-off by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
Merge pull request #21 from GiorgosPa/aps_package

aps_package: various fixes