[petsc-dev] make sure all packages/*.py cleanup before building

[Barry Smith]

   Satish,

    Could you please go through all the packages/*.py in both directories and make sure that the install process always cleans up removing .o .a etc files before building? Usually it would be with a make clean call but not all packages may have this. 

   Thanks

     Barry

Likely some more of them just leave junk lying around and don't properly recompile everything with a new build as we need them to.