Added single difference type and generating function.
Initial import of CLAPACK 3.2.1 CMAKE direct from Netlib
CLAPACK and BLAS building both native and for Cortex M4
Initial import of CBLAS C interface to BLAS
CBLAS interface now building native and for Cortex M4
Initial import of LAPACKE C insterface to LAPACK
LAPACKE builds native and on Cortex M4
Only build LAPACK/BLAS functions that are required by libswiftnav
Otherwise the build takes a VERY long time
Fixes so we can build against LAPACK
Fix warnings from arithchk
Merge pull request #19 from fnoble/lapack

LAPACK/BLAS