Incorrect winter handling in serials prediction code

[Dan Wells]

The current serials prediction code has an exception for handling cases where 'Winter 2010' is followed by 'Spring 2010' rather than 'Spring 2011'. This exception assumed the more common case of a combined subfield $y, e.g.:

$yps24,21,22,23

In doing so, it incorrectly handled less common cases where the $y is listed separately:

$yps21$yps22$yps23$yps24

This change (with test data) ensures we only check the first $y for our 'early winter' exception.

Fix is here:

http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/dbwells/winter_prediction_fix

This should be backported through 2.0 (it picks cleanly).

[Mike Rylander (mrylander)]

Picked into master, 2.1 and 2.0. Thanks, Dan!

[Mary Moran (mmoran)]

Thanks Dan and Mike: I am working with this intensely and Thanks much for the report Dan and the fix Mike. Most excellent.
Mary