Xcode 13.x compatibility

Thanks to @rshuston for this fix.

Leopard & PPC compatibility

Yes, someone wanted it, and they did the heavy lifting, so why not? ;-)

Bug fix release: 10.6 compatibility

Some of the symbols we are overriding are not present in Snow Leopard. So to support these older versions we're now using preprocessor macros to delete symbols we don't need.

Mavericks fixes

This release fixes two issues encountered in Mavericks.

1. The 10.9 SDK no longer supports directly linking to vecLib; instead, it seems we must go through the Accelerate framework instead.
2. There is a bug in the Mavericks implementation of sgemv when the input data is not aligned on 8-byte boundaries (yes, 8, not 4). I've added code to address this issue by intercepting sgemv calls, and translating them to equivalent sgemm calls. The translation occurs only if the alignment would exercise the bug; otherwise, the data is passed directly to sgemv.

The code has also been refactored to increase reuse of the custom BLAS replacements.

Bug fix release: added two LAPACK auxiliary functions

cladiv and zladiv need the same wrapper treatment.

Added Makefile, test code

v0.2.0

Updated license, improved README.md, added Makefile, test code

Initial release

v0.1.0

Documentation improvements, copyright notices