Log Message:
Update less to 481:

	Major changes between "less" versions 458 and 481

* Don't overwrite history file; just append to it.

* New command ESC-G goes to end of currently buffered data in a pipe.

* Disable history feature when compiled with LESSHISTFILE set to "-".

* In more-compatible mode, make the -p option apply to every file opened,
  not just the first one.

* In more-compatible mode, change the -e option to work like -E, not -EF.

* Treat multiple CRs before LF are like one CR (all the CRs are hidden).

* Allow "extra" string in lesskey file to append to a multi-char command
  (like a search pattern), without executing the command.

* Ignore -u/-U setting while viewing help file, so that
  underline and bold chars are displayed correctly.

* Improve detection of "binary" files in UTF-8 mode.

* Fix bug with ++ commands.

* Fix bug where prompt was sometimes not displayed with +G.

* Fix possible memory corruption

* Fix bugs and improve performance in ampersand filtering.

* Automate construction of Unicode tables from Unicode database.

* Allow %% escape sequence in LESSOPEN variable.