Less version 561

Version 561 was released on 11 May 2020.

These are the differences between version 551 and version 561:

• Update Unicode tables.
• Treat Hangul Jamo medial vowels and final consonants as zero width.
• Display error message immediately when -o is toggled and input is not a pipe.
• Fix regression: make screen repaint when "squished" and a no-movement command is given.
• Fix erroneous EOF calculation when F command is interrupted.
• Make WIN32C version include this fix from 551: Don't count lines in initial screen if using -X with -F.
• Fix display bug in WIN32C version.
• Fix memory corruption when built with libtermcap.
• Support libtinfow.