Less version 451

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.