Holidays and dates

- improved dateformat handling now defaulting to YMD set via
  dateformat.holiday variable
- fixed missing sorting in holiday table output when running
  calendar.holidays=full
- renamed reportdateformat to dateformat.report
- added config file checking for calendar.holidays and calendar.details
- added 2 holiday files for SE and US (watertown, MA)

doc/rc/holidays-US.rc

@@ -0,0 +1,28 @@
+holiday.newyearsday.name=New Years Day
+holiday.newyearsday.date=20100101
+holiday.martinlutherkingday.name=Martin Luther King Day
+holiday.martinlutherkingday.date=20100118
+holiday.presidentsday.name=Presidents Day
+holiday.presidentsday.date=20100215
+holiday.patriotsday.name=Patriots Day
+holiday.patriotsday.date=20100419
+holiday.memorialday.name=Memorial Day
+holiday.memorialday.date=20100531
+holiday.independenceday.name=Independence Day
+holiday.independenceday.date=20100704
+holiday.independenceday2.name=Independence Day observed
+holiday.independenceday2.date=20100705
+holiday.laborday.name=Labor Day
+holiday.laborday.date=20100906
+holiday.columbusday.name=Columbus Day
+holiday.columbusday.date=20101011
+holiday.veteransdays.name=Veterans Day
+holiday.veteransdays.date=20101111
+holiday.thanksgiving.name=Thanksgiving Day
+holiday.thanksgiving.date=20101125
+holiday.christmaseve.name=Christmas Eve
+holiday.christmaseve.date=20101224
+holiday.christmasday.name=Christmas Day
+holiday.christmasday.date=20101225
+holiday.newyearseve.name=New Years Eve
+holiday.newyearseve.date=20101231