Log Message:
Update www/vistors from 0.4a to 0.5:
Fix required for googlebot changes, New reports including a new
bidimentional map that shows traffic level in the whole year, unique
visitors for every month, better generation of graphviz graphs
including percentages in arcs, nodes for google, external links,
and no referere, 50% less memory used, Highlight color for weekend
changed to be more visible, most stats are now made by unique visits
and not by number of accesses, many bugs fixed, a real manual page.