(Fline_beginning_position): If N is not 1,

(Fline_beginning_position): If N is not 1,
pass t to Fconstrain_to_field for ESCAPE-FROM-EDGE.

(preceding_pos): Function deleted.
(text_property_stickiness): Decrement POS directly.
Fix a confusion that used PT instead of POS.

(find_field): Properly handle the case
of a field boundary where `field' inherits from neither side.

(Ffield_beginning, Ffield_end): Doc fixes.
(Ferase_field, Ffield_string, Ffield_string_no_properties): Doc fixes.