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objects.

  The initial property value should be from the position preceding
  POSITION, not following it.

  Made a subr (was `next_single_char_property_change').
  Do more error checking, and cleanup limit behavior.
(Fprevious_single_char_property_change): New function.
(syms_of_textprop): Initialize new subrs.

(syms_of_textprop): Intern it.

(syms_of_textprop): Declare it as a Lisp variable.

Fset_text_properties, but with additional parameter
SIGNAL_AFTER_CHANGE_P.  If that is nil, don't signal after
changes.
(Fset_text_properties): Use it.

instead of calling error.

(text_property_list, verify_interval_modification,
interval_has_all_properties): Ditto.

(add_text_properties_from_list): New.
(extend_property_ranges): New.
(validate_interval_range): Make it externally
visible.

(syms_of_textprop): Initialize it.

in a string's intervals start from zero.
(validate_interval_range, interval_of, Fnext_property_change)
(property_change_between_p, Fnext_single_property_change)
(Fprevious_property_change, Fprevious_single_property_change):
(Ftext_property_any, Ftext_property_not_all): Implement that.

Undo previous change.

position for string when comparing with LIMIT.
(property_change_between_p): Likewise.
(Fnext_single_property_change, Fprevious_property_change): Likewise.
(Fprevious_single_property_change): Likewise.

(interval_of): New function.

(Fprevious_char_property_change): New function.
(syms_of_textprop): defsubr them.

(Fremove_text_properties): Call modify_region and signal_after_change
only for buffers, not for strings.

Don't call modify_region or signal_after_change here.
(Fset_text_properties, Fadd_text_properties, Fremove_text_properties):
Call them here when appropriate.

Call modify_region with ints.

Fnext_property_change, Fnext_single_property_change,
Fprevious_property_change, Fprevious_single_property_change,
Fadd_text_properties, Fput_text_property, Fset_text_properties,
Fremove_text_properties, Ftext_property_any, Ftext_property_not_all):
Harmonize arguments with documentation.

Call signal_after_change.

even if we also merge an interval.

limit = t; don't return t.

(verify_interval_modification): Moved from intervals.c.
(interval_insert_behind_hooks, interval_insert_in_front_hooks): New variables.
(report_interval_modification): New function.

use it properly for overlays_at.