Fix Sanity Check Double Checking X Value

Add Help Message for Options

Displays the available args and shows the basic syntax.

Changes the second size.x check to size.y.

Compression

fix: don't discard empty inner nodes; don't stop recursive refining unless there are too many duplicates

print warning and abort partitioning if partitioning is unsucessfull (due to many duplicates) (#427)

fix regression with extra attributes

Cmake