Default to fail on non-computable expressions also on the command line
Default to fail on non-computable expressions also on the command line

This unifies the behavior of the Galaxy wrapper and the underlying
Python script, and updates some source code comments.

nsoranzo/tools-iuc,gregvonkuster/tools-iuc,galaxyproject/tools-iuc,jj-umn/tools-iuc,galaxyproject/tools-iuc,jj-umn/tools-iuc,jj-umn/tools-iuc,loraine-gueguen/tools-iuc,pavanvidem/tools-iuc,pavanvidem/tools-iuc,gregvonkuster/tools-iuc,loraine-gueguen/tools-iuc,pavanvidem/tools-iuc,jj-umn/tools-iuc,nsoranzo/tools-iuc,galaxyproject/tools-iuc,loraine-gueguen/tools-iuc,nsoranzo/tools-iuc,loraine-gueguen/tools-iuc,nsoranzo/tools-iuc,pavanvidem/tools-iuc,loraine-gueguen/tools-iuc,pavanvidem/tools-iuc,loraine-gueguen/tools-iuc,gregvonkuster/tools-iuc,loraine-gueguen/tools-iuc,nsoranzo/tools-iuc,galaxyproject/tools-iuc,jj-umn/tools-iuc,nsoranzo/tools-iuc,jj-umn/tools-iuc,galaxyproject/tools-iuc,jj-umn/tools-iuc,gregvonkuster/tools-iuc,galaxyproject/tools-iuc,pavanvidem/tools-iuc,gregvonkuster/tools-iuc,galaxyproject/tools-iuc,gregvonkuster/tools-iuc,gregvonkuster/tools-iuc,nsoranzo/tools-iuc,pavanvidem/tools-iuc