Sync zoneinfo database with tzdata2009a from elsie.
asia: 8.24 -> 8.25
backward: 8.6 -> 8.7
europe: 8.18 -> 8.20
northamerica: 8.24 -> 8.26
zone.tab: 8.21 -> 8.26
From Arthur David Olson's comments:
* asia - change Katmandu to Kathmandu
* backward - provide Katmandu link
* europe - correct Swiss rules
* northamerica - clearer definition of Cuban transitions (no binary change)
- Resolute changes abbreviation (but not time) twice a year
* zone.tab - Change Katmandu to Kathmandu
- Change Resolute from Eastern Time to Eastern Standard Time