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Purpose  : Find lowest and largest points on a surface generated by one 
           or more natpot or CPD files. This is similar to vminmax but 
           skipping the generation of a PES file.

Usage    : npotminmax [-D -mnd -srf -d -ver -w -h -?] 

Options  :
 -D DIR  : The output is directed to DIR. This option overwrites "name" 
           in the run-section of the input file.
 -mnd    : Enables creating a name directory.
 -d DIR  : The new dvr is read from directory DIR. This option overwrites 
           "readdvr" in the run-section of the input file.
 -srf    : Write potential to ASCII file "srf.asc"
           (one energy per line like readsrf input).
 -n num  : Print num maximal and minimal values. The default is num=10.
 -ver    : Version information about the program.
 -w      : Existing output is overwritten.
 -h -?   : Print this help text. 
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