More detailed errors when you can't open the input file.
More detailed errors when you can't open the input file.

This includes printing the full path in the log file (perhaps unwanted?)
But for now it helps diagnose user problems.
enochd/RMG-Py,nickvandewiele/RMG-Py,pierrelb/RMG-Py,nyee/RMG-Py,pierrelb/RMG-Py,nyee/RMG-Py,enochd/RMG-Py,KEHANG/RMG-Py,faribas/RMG-Py,faribas/RMG-Py,comocheng/RMG-Py,nickvandewiele/RMG-Py,chatelak/RMG-Py,KEHANG/RMG-Py,chatelak/RMG-Py,comocheng/RMG-Py