[tz] Ecuador time zone list

[Paul Eggert]

Thanks for taking a look at it. The first patch is OK now that we've 
worked around nawk's bugs, so I installed it (albeit with a different 
URL). The other two patches have problems, though. They assume that 
zone1970.tab and zone.tab are the only two possibilities, but a primary 
reason for -t option is to let users choose other possibilities of their 
own design.

So the second patch needs to be more generic, and not say that there are 
just two *.tab files; it also needs to say that the -t option is 
experimental. I suppose it also needs to document the current *.tab file 
format.

And the third patch goes in the wrong direction, as it hardwires the 
assumption that 'zone1970.tab' and 'zone.tab' are the only two choices 
and it outputs something cryptic and unactionable to boot. If we're 
going to change tzselect in this area perhaps it would be better for 
tzselect to act just as now, but if the user says "no" at the end then 
give the user an option of trying again with the other *.tab files.