Support named data types that define enumerated values; also other small changes

- named data types can have both patterns (already supported) and
  enumerations; they are now included in the HTML report
- parameters can override and extend named data type patterns/enumerations
  in the usual way
- --showreadonly is now enabled by default (so deprecated); can switch
  off this behavior using --noshowreadonly

git-svn-id: https://tr69xmltool.iol.unh.edu/repos/cwmp-xml-tools@299 3cbeabd2-4c38-11dd-a539-d7a0e886001f
Merge branch 'master' of https://github.com/BroadbandForum/cwmp-xml-tools