6CYANA: read prot - CYANA command

Parameters: file=<filename>.prot           (required)
            deviation=<real>               (default: 1.0E10)
            reference                      
            append                         
            add                            
            multiple                       
            index                          
            unknown=error|warning|skip     (default: error)

Reads a Xeasy chemical shift list. A warning message is printed
if chemical shifts are present simultaneously for an atom and its
corresponding pseudo atom. Optionally, only chemical shifts of
currently unassigned atoms are added. For chemical shifts that are
present in both lists and that differ by more Dw (in ppm), a warning
is printed.
