[tz] 2018e Morocco

[Paul Eggert]

Kiley Walbom wrote:

> Rule       Morocco              2013       max       -              Oct         lastSun 3:00       0              -
> Rule       Morocco              2036       only       -              Oct         19           3:00       0              -
> Rule       Morocco              2037       only       -              Oct         4             3:00       0              -
> 
> Our new program "thinks" there is an overlap in the end dates.  After looking at the rules we believe the end date for line 893 should look like this:
> 
> Rule       Morocco              2013       2035       -              Oct         lastSun 3:00       0              -

No, because then the end dates from 2038 on would be missing. This is important 
for platforms where time_t doesn't expire in 2038 (and these platforms should be 
universal by then).

Multiple rule lines can apply during the same year. So, for example, in 2036 the 
"2013 max" and "2036" rules both apply, and the former is a no-op because 
standard time has already been put into effect by the latter.