Log Message:
Update to 458

Changelog:
Version 458 was released on 4 Apr 2013.

These are the differences between version 451 and version 458:

    Allow backslash escaping of metacharacters in LESS environment variable if \ 
the --use-backslash option is set.
    Don't quit if syntax errors are found in command line options.
    Increase sizes of some internal buffers.
    Fix configure bug with --with-regex=none.
    Fix crash with "stty rows 0".
    Fix Win32 attribute display bug.
    Fix display bug when using up/down arrow on the command line.

Version 451 was released on 21 Jul 2012.

These are the differences between version 444 and version 451:

    Add ESC-F command to keep reading data until a pattern is found.
    Use exit code of LESSOPEN script if LESSOPEN starts with "||".
    When up/down arrow is used on the command line immediately after typing \ 
text, the next command starting with that text is found.
    Add support for GNU regex.
    Add configure option --with-regex=none and fix compile errors when compiling \ 
with no regex library.
    Fix bugs handling SGR sequences in Win32.
    Fix possible crashes caused by malformed LESSOPEN or LESSCLOSE variables.
    Fix bug highlighting text which is discontiguous in the file due to \ 
backspace processing.
    Fix bug in displaying status column when scrolling backwards with -J and -S \ 
in effect.