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

Usage    : npotminmax [-D -mnd -t -c -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.
 -t FILE : Do not run over the complete grid but use dvr indices in FILE 
           (n blank separated integers per line).
 -c FILE : Substract potential in FILE (one energy per line, like readsrf 
           input) before evaluation.
 -d DIR  : The new dvr is read from directory DIR.
 -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. Maximum is 100.
 -ver    : Version information about the program 
 -w      : Existing output is overwritten.
 -h -?   : Print this help text. 
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