Ignore zero probability states in transition
Changes for #38 and #247

Particle filtering still allows using the single universe transition
function even with a non-empty static universe, but this has been
deprecated.
Fixes for #67
Merge remote-tracking branch 'upstream/DEV2.3.0.0' into DEV2.3.0.0
Merge remote-tracking branch 'upstream/DEV2.3.0.0' into DEV2.3.0.0
Remove warning
Merge pull request #266 from wkretschmer/DEV2.3.0.0

Filtering updates, warning fixes