[tz] zic throws warning for 2007a

[Paul Eggert]

Thanks for reporting the problem. For now let's work around it by changing the 
abbreviation to "MMT"; although "MMT" is not technically correct, I expect it's 
better than overrunning the POSIX limit.

This prompted me to go back to old sources (wow, printed books!) to nail down 
Liberia's pre-1972 UT offset and the date of its 1972 transition to GMT. 
Proposed patch attached.

It would be interesting to know where Liberia's -0:44:30 came from. There's not 
much of interest on that longitude line (equivalent to 11 degrees 7 minutes 30 
seconds west).
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