fixed support for using Matlab LU and ILU solver from PETSc with Matlab engine. Also can put and get AIJ matrices to Matlab.

Hg-commit: cd41245d5e93414eca3b705e03c23057c94be31f

removed public interface for MatILUDTFactor*, this will now be handled by regular MatILU/ICCFactor* interface

Hg-commit: b130c3ab430985359fffc88a9c93110f07b98d13

removed PETSC_ARCH/conf/base and
added support for not setting PETSC_ARCH and PETSC_DIR with --prefix option

Hg-commit: e478f4df238e5763b64567336d7cf94ca5d89d58

I screwed up the fix

Hg-commit: 1512839750b62b8cdb9463f64013ddeddea6e5ef

Fix for Matlab

Hg-commit: 387e233fe3b685b7cfd97b2e3923310c76964764

fixed up linearsolvertable.html for new approach to external direct solvers,
fixed the manual pages for the external solver packages like MAT_SOLVE_SUPERLU etc

Hg-commit: 559872e478fd5924356bb412b

fixed up linearsolvertable.html for new approach to external direct solvers,
fixed the manual pages for the external solver packages like MAT_SOLVE_SUPERLU etc

Hg-commit: 559872e478fd5924356bb412b1d4573c23d52501

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removed -I$PETSC_DIR from make system and changed the corresponding
#include "src/dsdsdsds" to "../src/sdsdsds" in the source code

Hg-commit: 6e3c4cc4b4bfcb366bae9b71afcb5009c1f0429d

* Using MUMPS, MatGetInfo(...,&info), info.nz_allocated is given for the
initial matrix (not the factorized one). Currently I use :
- Mat_MUMPS *lu=(Mat_MUMPS*)mat->spptr;
- lu->id.INFOG(20)
to get

* Using MUMPS, MatGetInfo(...,&info), info.nz_allocated is given for the
initial matrix (not the factorized one). Currently I use :
- Mat_MUMPS *lu=(Mat_MUMPS*)mat->spptr;
- lu->id.INFOG(20)
to get the same information. It's a dirty solution...

Added MatFactorGetSolverPackage(), also properly printed with -mat_view_info and -ksp_view

Hg-commit: d45534d976bbd57e4a4d4c4173150bb1403ccc76

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