* tzselect.ksh: Fix typo in implementation of undocumented -t option.
tzselect: improve heuristic in Africa

Add the product of the longitude difference and the cosine of the
latitude farther from the equator to the distance measure.  This
works better for the Congolese test case noted by Alan Barrett in:
http://mm.icann.org/pipermail/tz/2014-July/021229.html
The new heuristic is not perfect, but no heuristic is.
* tzselect.ksh (abs, min): New functions
(convert_coord): Rename local to avoid name clash.
(gcdist): Rename from dist.
(pardist, dist): New functions.
* NEWS: Document this.