GitLab

Fixes #12.

During injection campaigns, search pipelines can create coincs unrelated to
injections.  This adds an option to ligo-skymap-stats to ignore FITS files for
which the inspinj database does not provide a match to an injection.

A misspelled identifier (`parser` instead of `_parser`) caused an
exception to be raised instead of a user-friendly error message to
be printed if the posterior samples file lacked a distance column.

Thanks to @salvatore-vitale for reporting this.

We were using exact floating point comparison to map out the faces
and vertices of HEALPix pixels. When a vertex that is shared
between two faces had slightly different floating-point coordinate
representations in different faces, contours were lost.

In the new approach, we identify vertices by the set of faces that
share them.

Also, the `ligo-skymap-contour` tool got 10x faster thanks to an
optimization that allows us to skip most pixels that are on the
interior or exterior of the contour.