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)

many fixes to build on Ios
-include ios project file that never properly got in repository
-remove lots of dead Tao code that was not handled by any compiler
-cleanup directions for ios builds

tao: documentation update

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

tao: revert tron changes, change should be made in stcg

tao: fixed - allow various ksp solvers in tron

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

tao: namespace TAO subvec and submat routines and make intern

fix Tao unconventional naming of TAOLINESEARCH_XXX_CTX TAOLINESEARCH_MT etc

changed TaoTerminationReason TaoConvergedReason
changed TaoLineSearchTerminationReason to TaoLineSearchConvergedReason

reason: consistency with the rest of PETSc

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

changed TaoSolver usage to Tao

added petsc to front of tao public includes

move tao vector operations over to Vec directory, fix a couple names and calling sequences

merged TAO_INFINITY and SNES_VI_INF into PETSC_INFINITY

fixed quote marks for includes to <>

remove tao-private include directory, private goes into petsc-private

tao: remove trailing spaces from sources