#3 Emacs mode: inconsistent behavior with "mark" and "cursor"

[Martin Kraemer]

When editing in emacs mode, the position of the
invisible "Mark" after delete and insert operations
could be improved.
Intuitively, the mark should move with the text, i.e.,
when I delete the word "two " from "one two three", and
the mark is somewhere in the word "three", the I still
want the mark at the same spot in the word "three"
where it was before.

The appended patch does that for the normal delete
operations (I hope I caught all of them). The
(functionally) same fix has been submitted to tcsh
development.

[Martin Kraemer]

Patch for mark+cursor operations