Merge branch 'rmills/add-aijmkl'

* rmills/add-aijmkl:
Adds AIJMKL matrix class to facilitate use of MKL sparse BLAS routines
BitBucket Pull Request 737
This is the initial version of the AIJMKL matr

Merge branch 'rmills/add-aijmkl'

* rmills/add-aijmkl:
Adds AIJMKL matrix class to facilitate use of MKL sparse BLAS routines
BitBucket Pull Request 737
This is the initial version of the AIJMKL matrix class,
a subclass of AIJ that has the goal of using MKL sparse BLAS routines whenever practicable.
If the MKL version is new enough, the sparse inspector-executor
("SpMV2" -- terrible name, but that's what the MKL team called it) routines are used by default.
Currently only MatMult, MatMultAdd, MatMultTranspose, and MatMultTransposeAdd operations are supported,
but more will be added once this initial attempt is at a point
that it provides an acceptable framework for adding additional further functionality.

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Fixed AIJMKL code breaking things when PETSc is built without Intel MKL.

Initial skeleton for MATSEQAIJMKL matrix type that uses MKL sparse BLAS
routines. Currently only implements mult and multadd operations, but
ready to be expanded.