string ->untabify: tabs=[int|vector]Replaces all tab characters (ASCII 9) by spaces, preserving the layout.
The argument specifies the positions of the tab-stops. If this is an
integer it specifies infinitely tab-stops at the specified intervals. If
it is a vector it should be a vector of integers. If tabs
is omitted 8 is used as a default value.
The main application area is handling of plain (Unix) ASCII text.