This function replaces the default suppression code in a table.
Arguments
- output
 Table containing suppressed values.
- code
 The replacement suppression code.
code = NAby default; this is ideal for plotting as ggplot automatically removes NAs.
This function replaces the default suppression code in a table.
Table containing suppressed values.
The replacement suppression code. code = NA by default; 
this is ideal for plotting as ggplot automatically removes NAs.