New regex functions: m^$, m^, m$, and others.

* regex.c (do_match_full, do_match_full_offs, do_match_left,
do_match_left_offs, do_match_right, do_match_right_offs):
New static functions.
(regex_match_full_fun, regex_match_right_fun,
regex_match_full, regex_match_left, regex_match_right,
regex_range_full, regex_range_left, regex_range_right):
New functions.
(regex_init): Register f^$, f^, f$, m^$, m^, m$, r^$,
r^ and r$ intrinsics.

* regex.h (regex_match_full_fun, regex_match_right_fun,
regex_match_full, regex_match_left, regex_match_right,
regex_range_full, regex_range_left, regex_range_right):
Declared.

* txr.1: Documented new functions.

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