removal of AOData PETSc object this week

[Barry Smith]

  We will be removing the AOData object from petsc-dev in the next
week. If you are using it we recommend taking the code from petsc-dev
and maintaining it yourself. We appologize for having to make this step
but we cannot maintain the code and are developing an alternative approach.

Note that the AO object is NOT being removed (nor will it be).

   Barry