Treat UNIQ column as signed integer rather than unsigned integer
All functions in ligo.skymap.moc
now assume that uniq
is a
signed integer. This makes it easier to call these functions with
Numpy indexing routines, which work with signed integers. Also,
saved multi-order sky maps will now be read correctly by tools
such as fv
from HEASOFT, which do not correctly handle unsigned
integer columns.
See emfollow/userguide#115.