cleanup of use of PetscOptionsInt and friends including use of flag final argument

tao->ksp_its is per iteration, tao->ksp_tot_its is per solve

removed Tao use of antediluvian PETSC_C_BEGIN/END with PETSC_EXTERN for Tao implementation class constructors

separate total TAO ksp count from per-iter count

docs: fix errors of type:
manualpages in: /sandbox/petsc/petsc.clone/src/tao/unconstrained/impls/nls
make[7]: [manualpages] Error 1 (ignored)

tao: documentation update

add a tao solver page to man pages for each solver (could be filled in a bit more)

add tao solver table and start to write solver man pages

removed MatStructure arguments from Tao

KSPSetOperators() no longer has the MatStructure argument. The Mat objects now track that information themselves. Use KPS/PCSetReusePreconditioner() to prevent the recomputation of the preconditioner

KSPSetOperators() no longer has the MatStructure argument. The Mat objects now track that information themselves. Use KPS/PCSetReusePreconditioner() to prevent the recomputation of the preconditioner if the operator changed in the way that SAME_PRECONDITIONER did with KSPSetOperators()

SNES/TS still need to be cleaned up to better utilize the new interfaces

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completed cleanup of removal of matrix pointers to compute jacobian routines

update changes file

fixed tao examples to no longer use Mat* arguments for Jacobian/Hessian etc computations

fix Tao unconventional naming of TAOLINESEARCH_XXX_CTX TAOLINESEARCH_MT etc

fix some VecGetArray() to VecGetArrayRead() and const in Tao source code

changed TaoTerminationReason TaoConvergedReason
changed TaoLineSearchTerminationReason to TaoLineSearchConvergedReason

reason: consistency with the rest of PETSc

remove wierd handling of options and options prefixes in Tao

fixed more Tao print format statements

set tao tolerances for single precision

BTW: there are all kinds of crazy tolerances all over the place; needs to be rationalized

fixes to tao to compile in single precision

changed TaoSolver usage to Tao

added petsc to front of tao public includes