Add Option: ClassifiedFee

  Add option to set minimum fee for publishing classifieds. Many viewers have a
  hard coded minimum of 50, which makes publishing classifieds fail where grids
  have no economy. This allows the grid to set the minimum fee to a suitable
  value for their operation.

  The option is located in the [LoginService] section and defaults to 0. The
  value is sent as "classified_fee" in the login response.
Merge branch 'master' of /home/opensim/src/opensim