Add row groups of an object of ztable
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z | 
 An object of ztable  | 
rgroup | 
 A character vector indicating names of row group. Default value is NULL  | 
n.rgroup | 
 A integer vector indicating the numbers of rows included in each rgroup Default value is NULL  | 
cspan.rgroup | 
 An integer indicating the column span of rgroup  | 
color | 
 A character vector indicating the font color of rgroup.  | 
bg | 
 A character vector indicating the background color of rgroup.  | 
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