Updated: vttest 20210210

[Brian Inglis]

The following package has been upgraded in the Cygwin distribution:

* vttest    20210210

Tests the functionality of a VT100 terminal (or emulator thereof).
Tests both display (escape sequence handling) and keyboard.
The program is menu-driven and contains full operating instructions.
To run a given menu-item, you enter its number. You can run all
menu-items (for a given level) by entering an asterisk, i.e, '*'.

It has been enhanced to support and test many xterm control and status
escape sequences, and it is mainly used nowadays for testing emulator
compatibility.

See the project home page for more information:

        https://invisible-island.net/vttest/

20210210 changes include:

* improve test-screen for VT420 cursor movement, when left/right
  margins are enabled (prompted by discussion with Tom Szilagyi).

* updated/improved configure macros, i.e., for shellcheck-warnings