20050311.1
# new markup: ~ instead of [[ and !

20031217.1
# \*q is a " mark
# "__WikiWord" wasn't being escaped (because \b doesn't match _)
# ignore sections marked between "^.ig" and "^.."

20031208.1
# don't append "|" to the end of a table row

20031121.1
# \(bv = vertical bar

20030924.3
# get bullet points
# end paragraph properly for .IP
# detect nroff rather than troff mark-up and die gracefully
 - Is this the real problem, or just undocumented tags?

20030924.2
# \/ is an escape for /

# look for __manpagename__ (section) as well as ''

20030924.1

# tidy up usage and version messages

# add licence

# suggestions from Craig Box:
  * `` and '' are replaced by "
  * pick up some indents (makes them monotype)
  * work around ;...: indents that contain the : char