#761 Tweak the date gap in the "Title dates after Publication dates" report

[Ahasuerus]

Tweak the date gap in the "Title dates after Publication dates" report. At this time it only finds titles whose title year is 2+ years ahead of the publication year of the publication that they appear in. We want to change it to 1+ years.

[Ahasuerus]

Implemented in:

mod/titles_later_than_pubs.py 1.2
nightly/nightly_update.py 1.79

Installed in r2105-002 on 2015-01-08. Closing. May need to re-open later if we decided to make the report even more granular and check title month vs. publication month.