Syntax: DelTabs [0|1]
Abbreviation: DT
sets the DelTabs flag. When this flag is set, a ‘d’
will appear on the status bar, and the BackSpace and Del keys will
remove a tab’s worth of space characters if a TAB character could
have occupied the same whitespace in the current line as the removed spaces.
This is the deletion counterpart to the Tabs flag. See Tabs.