[Freeciv-Dev] demographics improvement

[Jeff Mallatt <jjm@xxxxxxxxxxxx>]

This patch keeps growing...

It is the same as my previous Demographics Improvement patch, but computes
and reports *both* Land Area and Settled Area.  The implementation is also
faster.

Additionally, this patch adds the new player score fields to the
civscore.log file generated by log_civ_score().  I tried to make sure this
is backwards-compatible with existing civscore.log files.

I uploaded the patch to:

ftp://ftp.freeciv.org/pub/freeciv/incoming/demographics-improvements-5.diff.gz

jjm