DATE_IN_ tests

[John Myers]

The rule promotion criteria don't appear to be doing the right thing 
with the DATE_IN_* tests.

These tests are essentially a group.  Once one of them has been paid 
for, the rest have negligible incremental cost.

DATE_IN_FUTURE_48_96 is disabled due to lack of hits, but the tests on 
either side of it are enabled.  Most of the DATE_IN_PAST_ tests are 
disabled due to S/O ratios below the cutoff.

I believe all of these tests should be active.  I'm not sure how to 
generalize this observation to other sets of eval tests.