(Fconstrain_to_field): Make sure we don't violate the

(Fconstrain_to_field): Make sure we don't violate the
argument preconditions of find_before_next_newline in the case
where both ONLY_IN_LINE and ESCAPE_FROM_EDGE are set and OLD_POS
was indeed at the edge.
(text_property_eq, text_property_stickiness): Don't
use initializers for auto variables of type Lisp_Object.
(find_field): Likewise.  Use braces around nested ifs.
(Fline_end_position): Store the raw eol in a variable, so that the
final expression doesn't look so ugly.
(Fconstrain_to_field): Doc fix.
(preceding_pos): Renamed from `preceeding_pos'.
(text_property_stickiness, find_field): Call preceding_pos,
not preceeding_pos.
(Ffield_string_no_properties): New function.
(text_property_stickiness, preceeding_pos): New functions.
(Ffield_string): Remove PROPS parameter.
(find_field): Add MERGE_AT_BOUNDARY parameter.
Rewrite to use stickiness of `field' property to resolve
ambiguous cases.
(Ffield_beginning, Ffield_end): Add ESCAPE_FROM_EDGE parameter.
(Fconstrain_to_field): Likewise.
(syms_of_editfns): Init Sfield_string_no_properties.
(Ffield_string, Ferase_field, Ffield_end):
Supply new MERGE_AT_BOUNDARY argument to find_field.
(Fline_beginning_position, Fline_end_position): Supply new
ESCAPE_FROM_EDGE parameter to Fconstrain_to_field.
Pass a value of Qt for the ONLY_IN_LINE argument to
Fconstrain_to_field (only matters if N != 1).
(Fconstrain_to_field): Add get/set-current-point
behavior when NEW_POS is nil.
(find_field): Use XSETFASTINT instead of make_number.
(Qfield): New variable.
(find_field, Ferase_field, Ffield_string,
Ffield_beginning, Ffield_end, Fconstrain_to_field): New functions.
(Fline_beginning_position, Fline_end_position): Constrain to any field.
(make_buffer_string_both): Remove minibuffer-prompt hack.
(syms_of_editfns): Initialize Qfield, and subr entries for
field functions above.