Log Message:
vttest: Update to 20200303

20200303
	+ spelling fixes found with codespell.

	+ correct a few other highlighting items for Turkish NRCS and DEC
	  Supplemental Graphic NRCS.

	+ correct highlighting for Spanish NRCS pound-sign in character-sets
	  (report by James Holderness)

	+ updated/improved configure macros

20191231
	+ updated/improved configure macros

	+ update config.guess, config.sub

20190710
	+ improve alternate-screen test, with additional cursor-position check.

	+ add extensions found in DEC standard 070 to the primary response table.

	+ updated/improved configure macros

	+ update config.guess, config.sub