Added mention that -pd is not supported
Improved specificity on rotations
Fixed formatting
Added rvu "origin" command requested by John M.
Added -n option to rvu for multiple rendering processes
Had to change new -R rendering option to -u to avoid conflict with rpiece
Added -R option for pure Monte Carlo rendering, replacing -DMC compile option
Fixed bug in rvu "move" command from last change and added "focus" command
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