Disable or fix some failing tests In particular: - in ess-rd-eval-ns-env-test, remove code that uses the company mode (it fails if the elpa-company package is installed) - in ess-test-r-startup-directory, disable a test case that fails when in build chroot for an unknown reason - in ess-test-r-help-mode, remove (forward-button 2), which curiously triggers a test failure when *not* in a build chroot - in ess-test-inf.el, update the numbering of the “Browse[…]” prompts at two places (see #1071306)
