PCBDDC: remove trailing backspace

PCBDDC: stefano_zampini/apply-transpose branch was still using pcbddc->vec4_D. Now the code compiles.

Merge branch 'stefano_zampini/pcbddc-applytranspose' into stefano_zampini/pcbddc-multilevel-improvement

PCGAMG_Classical: Added Jacobi smoothing for the OptProl part

PCBDDC: demand wheter or not to rebuild local scatters to the right routine

PCBDDC: remove prints. Added coarse_subassembling to debugging output

PCGAMG_Classical: Fixes for complex and 64-bit index builds in the new interp.

PCBDDC: added reuse of coarse subassembling information

In order to do do, I had to change the MATIS class (I dont know why there was a guard for is->mapping in matis code)

Solved a couple of bugs

PCBDDC: added reuse of coarse subassembling information

In order to do do, I had to change the MATIS class (I dont know why there was a guard for is->mapping in matis code)

Solved a couple of bugs when doing multilevel and a dbg_viewer on a single level only

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PCGAMG_Classical: Added PCGAMGClassicalSetType() and registration

PCGAMG_Classical: Add thresholding for the prolongator entries

PCBDDC: coarse ranks are no longer contiguous (better memory management)

PCBDDC: remove prints

Merge remote-tracking branch 'origin/barry/fix-pcredistribute-memory-leak'

PCBDDC: KSPRICHARDON with PCBDDC is the default for BDDC coarse solver when doing multilevel

Extreme eigenvalues are computed if the coarse KSP is not preonly to accelerate convergence

PCBDDC: added FETIDPMatMultTranspose and PCApplyTranspose (for Dirichlet FETIDP preconditioner)

PCBDDC: support for PCApplyTranspose completed by solving the transpose of the coarse operator in PCBDDCApplyInterfacePreconditioner.

Function pointer is now set during object creation

PCBDDC: remove unneded guards

these guards were needed in the previous version of the code when PCBDDC coarse problem was handling through the enum PCBDDCCoarseProblemType

PCBDDC: added support for solving the transposed of the substructure correction

rhs, solution and work vectors for the correction are now parameters of the function

PCBDDC: added second parameter to PCBDDCApplyInterfacePreconditioner to determine if the interface preconditioner should be applied tranposed or not

The main reason for this is to avoid code duplica

PCBDDC: added second parameter to PCBDDCApplyInterfacePreconditioner to determine if the interface preconditioner should be applied tranposed or not

The main reason for this is to avoid code duplication

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PCBDDC: simplify PCBDDCApplyInterfacePreconditioner

coarse_psi_* now always exist. For symmetric problems, they point to the same object of coarse_phi_*

PCBDDC: rename private PCBDDCSolveSaddlePoint to a more explicative PCBDDCSolveSubstructureCorrection

PCBDDC: added initial implementation of PCApplyTranspose_BDDC

PCBDDC: propagate field split and neumann boundaries to coarse problem

PCBDDC: coarse matrix is structurally symmetric

PCBDDC: set compute topography to true with new field split