fix valgrind complain in on uninitialised value

Merge branch 'stefano_zampini/feature-pardiso-schur'

fixed up formatting of references in manualpages to consistent style

References:
+ 1. - ref1
. 2. - ref2
- 3. - ref3

previously the formatting was varied and ugly

replace !PetscBool with PetscNot(a)

add allowzeropivot and zeropivotdetected to PetscKernel_A_gets_inverse_A_#

enable zeropivot for pbjacobi, bs=3, baij matrix

rename crash and wouldcrash -> allowzeropivot and zeropivotdetected as suggested by Barry

add 'PetscBool crash,PetscBool *wouldcrash' to PetscKernel_A_gets_inverse_A_3() to handle zeropivot error

set 'ReplaceTinyPivot=NO' as default. See Sherry's email Re: zeropivot in superlu_dist on Jan 7, 2016 at 12:03 AM

support !A->erroriffailure

replace default FactPattern = SamePattern_SameRowPerm to SamePattern;
see Sherry's email Re: SuperLU convergence problem (More test) on 12/8/2015

Mat_MKL_Pardiso: fixes for complex-cxx builds

disable Cholesky factors for complex builds since the interface does not currently supports them
MatSolveTranspose now solves the transposed system (and

Mat_MKL_Pardiso: fixes for complex-cxx builds

disable Cholesky factors for complex builds since the interface does not currently supports them
MatSolveTranspose now solves the transposed system (and not the hermitian transpose) in the complex case

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Mat_MKL_PARDISO: added missing PETSC_EXTERN declaration

skip MatSolve() if matrix factorization fails

replacing SETERRQ with error output info and continue execution

superlu: fix complex build

Reported-by: Torquil Macdonald Sørensen <torquil@gmail.com>

Merge branch 'hzhang/matpackage-erroriffpe'

Merge commit '7b37fee' into maint

enable mat->errortype for chebyshev (all normtype), preonly, SOR and MG

enable mat->errortype for SOR and MG

rm MatFactorError from MatFactorInfo; skip MatSolve() when mat->errortype; rm extra space in names of matrix.c

more Revert "replace 'const MatFactorInfo' to 'MatFactorInfo' in MatFactor routines"

Revert "replace 'const MatFactorInfo' -> 'MatFactorInfo'"

This reverts commit af48bdc5724c729ddc55b84e8afd48f344de3945.

add "Mat fact" as an input to MatPivotCheck() for setting errortype into matrix fact

Barry suggests moving MatFactorError from MatFactorInfo into _p_Mat -- done with mumps.c