- Optimized Earned Value Management portlet in order to deal with projects > 10 years.

- Added error message for Gantt Resource Portlet that it doesn't work with projects
  > 10 years

lib/earned-value.tcl

@@ -117,12 +117,8 @@ db_foreach percentages $percentage_sql {
     for {set j $child_start_julian} {$j <= $child_end_julian} {incr j} {
 	set key "$j"
 
-	# No assignments during the weekend
-	array unset date_comps
-	array set date_comps [util_memoize [list im_date_julian_to_components $j]]
-	set dow $date_comps(day_of_week)
-
 	# Sum up percentages, except for weekends
+	set dow [im_date_julian_to_dow $j]
 	if {6 ne $dow && 7 ne $dow} {
 	    set perc 0.0
 	    if {[info exists percent_hash($key)]} { set perc $percent_hash($key) }