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* python 3 fix for ncepgrib2.
* change behavior of open.select, so that it always searches
from beginning of file (not from where iterator is currently
positioned).
* fix calculation of longitudes for gridType='regular_ll', when
longitudeOfLastGridPoint < longitudeOfFirstGridPoint. For
example, for ECMWF grids sometimes longitudeOfFirstGridPoint = 0
and longitudeOfLastGridPoint = -0.5. In such cases,
longitudeOfLastGridPoint should be treated as 359.5 (issue 39)