Corrected outstanding path command regressions.

Path command-specific functions (e.g., copy_path()) now properly perform
such command without throwing unexpected exceptions.

"And the feeblest keenings of
     the littlest kindling of
     the human fray
 Did sway with indolence in
 The pellicles of rotten rust dinning
 Madly, a
 Smarmy phosphorescence without
 Essential warming lust."