All fsets changed to defaliases.

All fsets changed to defaliases.
(kill-forward-chars, kill-backward-chars): Deleted.  These were
internal subroutines used by delete-char and delete-backward-char
before those functions were moved into the C kernel.  Now nothing uses
them.
(kill-line): Added kill-whole-line variable.  Defaults to nil; a
non-nil value causes a kill-line at the beginning of a line to kill
the newline as well as the line.  I find it very convenient.  Emulates
Unipress' &kill-lines-magic variable.
(next-line): Added next-line-add-newlines variable.  If nil, next-line will not
insert newlines when invoked at the end of a buffer.  This obviates three LCD
packages.
(left-arrow, right-arrow): New functions.  These do backward-char and
forward-char first. If line truncation is on, they then scroll left or
right as necessary to make sure point is visible.