Change the log grower from awk to Perl

This new implementation works correctly with the spaces (or lack thereof)
that occur in many requests. It is also twice as fast.

time gzip -dc clarknet_access_log_Sep4.gz | perl log-grow.pl 2 | ./wwwstats >/dev/null

real    2m12.530s

$ time gzip -dc clarknet_access_log_Sep4.gz | awk -f log-grow.awk 2 | ./wwwstats >/dev/null 2>/dev/null

real    4m20.005s
Update numbers
Fix record separation
Add evaluation prefix; Perl full path
Set memory limit and option to control it