make sure example does not send uninitialized data through MPI to confuse valgrind

make sure no initialized data is sent via MPI to confuse valgrind

tao fix memory issue discovered through valgrind

added a citation for pounders, Stefan finally came through

removed MatStructure arguments from Tao

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

changed TaoTerminationReason TaoConvergedReason
changed TaoLineSearchTerminationReason to TaoLineSearchConvergedReason

reason: consistency with the rest of PETSc

updates to Tao per request of Lisandro for Petsc4py

* I would like to have TaoGetConstraintTolerances(), right now I'm
defining it in petsc4py as shown in the link below:
https://bitbucket.org/petsc

updates to Tao per request of Lisandro for Petsc4py

* I would like to have TaoGetConstraintTolerances(), right now I'm
defining it in petsc4py as shown in the link below:
https://bitbucket.org/petsc/petsc4py/commits/ab01ebe336491190a2db85c179c48b1c64fdc673?at=master#chg-src/include/custom.h

* Look at all these definitions, they should be exposed in the C API
to be able to call e.g. TaoSetType(tao,TAOLMVM);
https://bitbucket.org/petsc/petsc4py/commits/ab01ebe336491190a2db85c179c48b1c64fdc673?at=master#Lsrc/PETSc/petsctao.pxiT4

Also removed -tao_method, removed tao_ from names of tao methods and fixed some tao source code formatting

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make sure example does not send uninitialized values through MPI to get caught by valgrind

tao: fix pounders indexing bug

tao: add max_it to least-square examples to prevent runaways

docs: fix 'Concepts' keyword in tao examples

added PetscStackCallBLAS() wrappers in tao code
removed all CHKMEMQ macros in tao code that have PetscStack calls that also check the memory

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

removed taoinitialize and taofinalize

added petsc to front of tao public includes

stop using taosolver.h includes

merged TAO_INFINITY and SNES_VI_INF into PETSC_INFINITY

remove taolapack.h it duplicated prototypes already in petscblaslapack.h

Merge branch 'balay/tao-to-petsc' of bitbucket.org:petsc/petsc into balay/tao-to-petsc

fixed quote marks for includes to <>

tao: fix negative blas counter in pounders