refextract: volumes with dashes

[kaplun]

refextract apparently doesn't understand dashes in volumes.

Nucl Phys A904-905 270c
becomes
Nucl.Phys.,A904,905

The search for
999c5s:Nucl.Phys.,A904,905
finds 192 records.

"http://arxiv.org/pdf/1307.2978.pdf has some dashes in the references. GROBID's output is pretty terrible in this case: <title/> M M Aggarwal <title level="m">Luo [STAR Collaboration], Nucl. Phys. A904-905, 911c (2013); L. Kumar [STAR Collaboration], Nucl. Phys. A904-905</title> (but at least is not mangling the dashes)."