(ANCHORED_OPTION, IGNORE_CASE_OPTION, NO_ANCHORED_OPTION,

(ANCHORED_OPTION, IGNORE_CASE_OPTION, NO_ANCHORED_OPTION,
NO_IGNORE_CASE_OPTION, NO_WILDCARDS_OPTION, NO_WILDCARDS_MATCH_SLASH_OPTION,
WILDCARDS_OPTION, WILDCARDS_MATCH_SLASH_OPTION): New enum values.

(long_options, usage, decode_options): Add support for --anchored,
--ignore-case, --no-anchored, --no-ignore-case, --no-wildcards,
--no-wildcards-match-slash, --recursion, --wildcards,
--wildcards-match-slash.

(decode_options): Implement the new way of interpreting exclude patterns.

(usage): --newer-mtime takes a DATE operand.  DATE may be a file name.

(OPTION_STRING, decode_options): Add -I, -y.  Currently these options
just print error messages suggesting alternatives.

(add_filtered_exclude): Remove.