A couple of test are failing only on Windows with older versions
of Julia.  Details are needed.

This change makes the complex QR sweep a more faithful translation
from LAPACK, to deal with (rarely arising) errors in the previous
version.  It also replaces "debug" keywords with a macro (disabled
in release) to reduce overhead.

This change improves documentation and implements some extra options
in the wrappers of LAPACK test generation routines.
It also adds the extra character-length arguments needed for recently
compiled versions of the library.

as noted by Pablo San Jose & Harmen Stoppels on Slack