• Corrected a check when OCSP stapling was configured for hosts
  where the responsible MDomain is not clear, by Michal Karm Babacek (@Karm).
• @uhliarik added documentation for the a2md command. Use xmlto man ./a2md.xml to generate it.
• Softening the restrictions where mod_md configuration directives may appear. This should
  allow for use in If and Macro sections. If all possible variations lead to the configuration
  you wanted in the first place, is another matter.