ViennaCL: Eliminated whitespace violations, removed/fixed erroneous comments.

ViennaCL: Now catching the correct type of exceptions (std::exception)

ViennaCL: Eliminated dead/unused code

ViennaCL: Fixed issues if size 0 is passed.

ViennaCL: Setting VIENNACL_WITH_OPENCL flag to enable OpenCL backend as default.

Could also be set depending on PETSC_HAVE_LIBOPENCL, so that ViennaCL could be used without OpenCL available.
Not con

ViennaCL: Setting VIENNACL_WITH_OPENCL flag to enable OpenCL backend as default.

Could also be set depending on PETSC_HAVE_LIBOPENCL, so that ViennaCL could be used without OpenCL available.
Not considered for now, since CPU-based kernels in PETSc are available anyways.

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ViennaCL: Removed seqviennacl/aijassemble.cxx (would trigger error, now uses existing fallback)

ViennaCL: Renamed files to fulfill conventions (.cpp -> .cxx, all lowercase), removed restriction of C++ everywhere.

ViennaCL: Added sequential AIJ matrix.

Compiles, 'make test' passes. Further testing required.
Injects similar to PETSC_HAVE_CUSP into existing functions.
A general concept for dealing with accelera

ViennaCL: Added sequential AIJ matrix.

Compiles, 'make test' passes. Further testing required.
Injects similar to PETSC_HAVE_CUSP into existing functions.
A general concept for dealing with accelerators is required here, but postponed after release 3.4.
aijAssemble.cpp is a stub, also row-compressed CSR is not yet supported.

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