changes for next PETSc release

[Barry Smith <bsmith@xxxxxxxxxxx>]

    There are two significant  changes I'd like to see before the  
next PETSc release:

1) remove the overly complicated (from a user perspective) matrix  
subclassing for the various external
     matrix solver packages and replace with MatSolverSetType() - 
mat_solver_type <type> that simply
     flips the various factorization/solver functions with those  
requested and

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
     to do it, but it is the right thing to do and should have been  
done originally.
.

    Maybe we can do a release in around a couple of months, it would  
be 2.4

   Barry