init_sep3d_par - Initialize a structure from parameters
logic= init_sep3d_par(sep3d *sep3dc,char *usage,char *data_type,char *file_type,int ndim,int nkeys)
structure to create
usage for tag ('INPUT','OUTPUT','SCRATCH')
datatype ("FLOAT","COMPLEX","BYTE")
filetype ("REGULAR","HEADERS","GRID")
number of dimensions
number of keys
Create a sep3d structure from another structure
superset