Clean up imports.  Use, e.g. BLAS.trsm!, instead of importing trsm!
Refined AsympReg specification.
Some cleanup.  This code is not included in the module.

It has been kept around so that I don't forget it.
Replace imports of functions in BLAS and LAPACK modules.
Replace imports of functions in BLAS and LAPACK modules.
Major modifications but still not working properly.
Revise model name and use current parameter estimates for comparison.