remove fatol and frtol concept from Tao; they are redundant and confusing compared to other tolerances

add boolean guards to check if tao default options have been changed

Set the options prefix correctly on tao->ksp and tao->linesearch.

add accessors to tao iteration counter, tao total iteration count

fixed missing CHKERRQ() detected by clang's --analyze

updated PETSc directory layout to match standard packaging strategies

include/petsc finclude,private,mpiuni
lib/petsc conf
bin/petsc*