Skip over undocumented commands

This is specifically needed (and brought to you by)
preview services.
Merge branch 'ignore-docs' into develop

* ignore-docs:
  Skip over undocumented commands
Add __version__ to bcdoc

cc @garnaat.
Add admonition visitors to text renderer
Don't use admonitionlabels
Merge branch 'visit-warning' into develop

* visit-warning:
  Don't use admonitionlabels
  Add admonition visitors to text renderer
Bumping version to 0.7.0
Merge branch 'release-0.7.0' into develop

* release-0.7.0:
  Bumping version to 0.7.0
Sort the list of commands.