(intervals_equal): Handle one arg null and other not.

(set_point): Considerable rewrite.  Handle intervals both
before and after the old and new point values.
Redo handling of invisible intervals, and of motion hooks.
(textget): New function.

(graft_intervals_into_buffer):
create_root_interval needs Lisp object arg.
Set tree to new root interval.
Don't test TREE_LENGTH if buffer has no intervals.
Rearrange code to copy properties so that it really
does merge the inserted ones into the inherited ones.
(traverse_intervals): Pass `arg' on recursive calls.
(split_interval_left): Use new_length as basis for length of new.

(traverse_intervals): New arg ARG.

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