Merge branch 'master' of bitbucket.org:petsc/petsc

Merge branch 'master' of bitbucket.org:petsc/petsc

Merge branch 'prbrune/snes-removesetfunctionnorm'

Conflicts:
src/snes/impls/composite/snescomposite.c

Removed extraneous SNESSetInitialFunctionNorm().

The norm is cached on vec_func after copy, so this is unnecessary.

Merge branch 'prbrune/snes-snesfunctiontype'

Fix to uninitialized Vec in SNESGetPCFunction()

This bug was noted by Jed in https://bitbucket.org/petsc/petsc/commits/ddd40ce523a7cea6c5531ba94c3449af29fb68c1#comment-283931

Added SNESGetPCFunction() which decides how to get the function from the NPC.

Remove accidental additions of PETSC_NULL from snespc.c

Check converged reason of snes->pc under new preconditioning organization.

In the case of the PC application, the SNES aborts with reason DIVERGED_INNER.
In the case of the line search, a failure of

Check converged reason of snes->pc under new preconditioning organization.

In the case of the PC application, the SNES aborts with reason DIVERGED_INNER.
In the case of the line search, a failure of the preconditioner looks like
a function domain error (so that exit will be proper).

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NEWTONLS works with preconditioned and unpreconditioned functions.

ASPIN (or other left-preconditioned Newton methods) can be run with
either the usual function or the preconditioned function monito

NEWTONLS works with preconditioned and unpreconditioned functions.

ASPIN (or other left-preconditioned Newton methods) can be run with
either the usual function or the preconditioned function monitoring
convergence.

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SNESLinesearchSetFunction() for setting what function the line search uses

Add SNESApplyPC() replacing the PC_LEFT control path in SNESComputeFunction()