Less version 530

Version 530 was released on 16 Feb 2018.

These are the differences between version 487 and version 530:

• Don't output terminal init sequence if using -F and file fits on one screen.
• When using -S, mark truncated lines with a special character. The character can be changed or disabled via the new --rscroll option.
• New command M marks the last line displayed on the screen.
• New command ESC-m removes a line mark.
• Status column (enabled via -J) now shows mark letters.
• Status column shows search matches even if highlighting is disabled via -G.
• A second ESC-u command will clear search match markers in the status column.
• Do same ANSI escape code filtering for tag matching that we do for searching, to help when viewing syntax-highlighted code.
• Catch SIGTERM and clean up before exiting.
• Fix bug initializing default charset on Windows.
• Handle keypad ENTER key correctly if it sends something other than newline.
• Fix buffering bug when using stdin with a LESSOPEN pipe.
• On Windows, allow 'u' in -D option to enable underlining.
• On Windows, use underline in sgr mode.
• On Windows, convert UTF-8 to multibyte if console is not UTF-8.
• Update Unicode tables to 2017-03-08.
• Pass-thru Unicode formating chars (Cf type) instead of treating them as binary chars. But treat them as binary if -U is set.
• Fix erroneous binary file warning when UTF-8 file contains ANSI SGR sequences.
• Fix bugs when using LESSOPEN and switching between stdin and other files.
• Fix some bugs handling filenames containing shell metacharacters.
• Fix some memory leaks.
• Allow some debugging environment variables to be set in lesskey file.
• Code improvements:
  • Use ANSI prototypes in funcs.h declarations.
  • Fix some const mismatches.
  • Remove archaic "register" in variable declarations.