improved exception message when multiple files found covering the same region in on-disk genome alignment; added raising of more descriptive exception when trying to load on-disk genome alignment and requesting fail on missing index, but not providing any index extensions to look for.
improved exception message when multiple files found covering the same region in on-disk genome alignment; added raising of more descriptive exception when trying to load on-disk genome alignment and requesting fail on missing index, but not providing any index extensions to look for.

pjuren/pyokit