PCPatch: Fixed name of constructor

PCPatch: Initial checkin
Contributed-by: Patrick Farrell <patrick.farrell@maths.ox.ac.uk>
This PC uses mesh traversal to assemble particular ASM PCs, such as Vanka smoothers.

Merge branch 'pr874/mapdes/pcmg-inject/master'

* pr874/mapdes/pcmg-inject/master:
This hooks everything up so that if the DM provides an injection we remember it in PCMG.
* Add DMHasCreateInjection

Merge branch 'pr874/mapdes/pcmg-inject/master'

* pr874/mapdes/pcmg-inject/master:
This hooks everything up so that if the DM provides an injection we remember it in PCMG.
* Add DMHasCreateInjection: Will be needed in PCMG.
* FAS: guard DMCreateInjection with DMHasCreateInjection
* PCMG: Use injection if the DM provides it

The mass-lumped scaling of the restriction is complete nonsense for most discretisations.
If the DM provides an injection, use it.
This injection is now used by DMRestrictHook_SNESVecSol for transferring the current state to the coarse grid.

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PCMG: allow injection matrix to be NULL

Fixed indentation.

Commit-type: style-fix

Fix some minor/semantic bugs identified by clang analyzer

Change PetscStrncat() to PetscStrlcat() to match BSD API where l represents total length

Update many uses of PetscStrcpy() and PetscStrcat() to the safer PetscStrncpy() and PetscStrlcat()

Commit-ty

Change PetscStrncat() to PetscStrlcat() to match BSD API where l represents total length

Update many uses of PetscStrcpy() and PetscStrcat() to the safer PetscStrncpy() and PetscStrlcat()

Commit-type: style-fix, feature
Thanks-to: Jed Brown

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PCMG: Need to destroy the injection matrix too

PCMG: Use injection if the DM provides it

The mass-lumped scaling of the restriction is complete nonsense for
most discretisations. If the DM provides an injection, use it. This
injection is now u

PCMG: Use injection if the DM provides it

The mass-lumped scaling of the restriction is complete nonsense for
most discretisations. If the DM provides an injection, use it. This
injection is now used by DMRestrictHook_SNESVecSol for transferring
the current state to the coarse grid.

show more ...

PCBDDC: another recipe, this looks very promising

PCBDDC: added a couple of more recipes for Stokes

initialize B_neigs to 0 and revert order of eigenvalue computation for recipe 2

Merge branch 'pefarrell/pccomposite-increment-tab-level'

PCBDDCGRAPH: fix a possible deadlock in the code

use a send buffer instead of a temporary variable

PCIS: if stiffness scaling is required, overwrite zero diagonal entries with 1

PCBDDC: return if maxneighs = 0

get rid of unneeded PC_ApplyOnMproc, fix manual page for parallel blocks for PCBJACOBI

Commit-type: style-fix, documentation

PCBDDC: cosmetic fixes

PCBDDC: added cc-based corner selection when coordinates are available

PCBDDC: use nearnullspace in alternative and pass it to the local solvers

Remove KSPSetUp call for local solvers that may prevent to properly setup approximate local solvers

PCBDDC: implement stabilized gram-schmidt for orthonormalization

PCBDDC: pass local coordinates if the local solver supports PCSetCoordinates

PCBDDC: string viewer not used

PCBDDC: added View ops to nullspace corrected solver

clean up the code a bit

PCComposite: increment tab level for sub PCs

Thanks-to: Patrick Farrell <patrick.farrell@maths.ox.ac.uk>

PCBDDCSUBSCHURS: minor fixes