Merge branch 'remove-deansification' into testsuite-work

Merge branch 'remove-deansification' into testsuite-work

* remove-deansification:
  automake: fix regression due to de-ansification support removal
  automake: cleanups after de-ansification support removal (2)
  automake: cleanups after de-ansification support removal (1)
  ansi: remove obsolete code/files for de-ANSI-fication support
  ansi: reject attempts to use automatic de-ANSI-fication support
  tests: remove tests about obsolete de-ANSI-fication support
  docs: remove description of de-ANSI-fication support from manual