get a flextable from a xtable object
Add or modify flextable`s headers or footers
Add a row of labels in header or footer part
Set flextable's headers labels
Set flextable's header or footer rows
Merge flextable cells horizontally
Delete flextable merging informations
Merge flextable cells vertically
Adjusts cell widths and heights
Modify flextable`s formatting properties.
make blank columns as transparent
Apply theme functions.
Define flextable`s content
Define flextable displayed values
set column formatter functions
Render flextable in rmarkdown (including Word output)