[RFC]: NSTimeZone patch

[Adam Fedor]

Automatically finding the system time zone is currently broken now (OK, 
I'll have to admit I'm partly responsible). If you don't set the time 
zone explicitly, NSTImeZone gets it from the tznam system function. 
However, tznam returns the abbreviation for the time zone. A previous 
post pointed out there is not currently a one-to-one correspondence 
between names and abbreviations. Even if there were, it would not 
always be correct. In fact, in some cases the GNUstep time zone files 
do not even have the required time zone file. For instance 
American/Los_Angeles returns the PST abbreviation, but the PST time 
zone file does not exist in the GNUstep time zone files.

This patch gets the time zone name directly using information available 
from the tzfile.h file, if possible, and also retrieves the time zone 
file from the system time zones first before checking the GNUstep time 
zones.

The down side is the time zone names are no longer portable between 
systems (of course they aren't really now with the current broken 
implementation). One way to fix that might be to encode the absolute 
offset of the time zone as well (I just thought of that so it's not 
addressed in this patch).

zone.patch
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