bug#58804: Inconsistency between ruler-mode, fill-column and whitespace-mode

[Heime]

Having set both fill-column and whitespace-line-column to 72, I noticed the 
following.

ruler-mode has the left end marker at column 72, but it should be at column 71 
because
column numbers start from 0.  Here an improvement would be appreciated.  That 
is, having
the ability to show a ruler variant that starts from value 1.  When one uses a 
block cursor,
the ruler left marker would then mark exactly column 72.  The user will knew 
that if he inputs
the next character he would have reached the line limit and the ruler left 
marker would coincide
with that position.