changes for next PETSc release

[Richard Katz]

>
>
> 2) properly name-space PETSc by putting a Petsc in front of all  
> PETSc objects, function names etc
>     (this will require changing a few names also to keep them below  
> the 32 character limit). This will
>     be very painful change for some users who are not comfortable  
> ever changing code, hence I hesitate

Perhaps it would be helpful to some people if you distribute a script  
that can be run in an application src/ directory to find/replace all  
affected function names.

Rich