Change Indonesian time zone names to reflect common practice.

* asia (Asia/Dili, Asia/Jakarta, Asia/Pontianak, Asia/Makassar)
(Asia/Jayapura): Use WIB/WITA/WIT rather than WIT/CIT/EIT, since
it's typical to use Indonesian-language abbreviations even when
writing in English.  I surveyed the Internet and Google Books and
found several independent English-language sources using WIB/WITA/WIT,
whereas it seemed only tz-inspired sources used WIT/CIT/EIT.
Problem reported several times, by George Ziegler, Priyadi Iman
Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and Benny Lin;
see Lin's summary of the reports in
<http://mm.icann.org/pipermail/tz/2013-February/018609.html>.
This change does not affect time zone offsets, just alphabetic
abbreviations, such as tm_zone in the BSD-style struct tm.
(Asia/Jakarta): Use BMT, not JMT, for mean time from 1923 to 1932,
as Jakarta was called Batavia back then.