pre112 - Y2K-like wraparound bug when creating/reading spool

Hi folks,

I've discovered a nasty little bug in pre112 when reading from a spool
created by slrnpull.  This bug may have been here since Day 1.  When
the article numbers get to INT_MAX (around 2.1 billion), they wrap,
and two things happen:

1) slrnpull will no longer fetch new articles
2) slrn will go into 100% CPU usage loop and never come out when
entering that group if 'read_active' is set

Here's the relevant lines in the slrnpull spool files (news server is
news.motzarella.org):

data/active:

    rec.motorcycles.harley 2126026959 4700 y

.minmax

    4700 2126026959

.servermin

   227

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