In large installations and installations that have been running for
some time, the amount of classification values will be so large that
it might cause the Reporter Professional to experience memory
problems.

This patch makes it possible to restrict the amount of data that is
inspected to generate these value lists. More specifically it allows
you to specify how far back (in years) the generator should go to
extract classification values from the data in the database.

It introduces the configuration directive CLASSVAR_CUTOFF_AGE, to be
used in /etc/opt/openit/openit.cfg. The value specified will be the
number of years to inspect. 1 = the current year only. 2 = current
year and last year, and so forth. 0 = inspect all data available.

The default value, if none is specified, is 2, i.e. to inspect data
from the current year and last year.