Correct FINALLY RETURN ... to FINALLY (RETURN ...) in the LOOP.

For some reason, LispWorks accepts FINALLY RETURN. This is not conforming
and generated an error in SBCL.
Explicitly test for INITIAL-ELEMENT and INITIAL-CONTENTS of data vectors.

In LispWorks, if either was NIL, it was ignored. In SBCL, the presence of
the keywords generated an error.
Use TYPE-OF to set the correct type when testing specific-array-element-type.
Increase the floating point epsilon for failing Hermitian matrix tests.
Explicitly specify type of permutation matrix contents to satisfy CCL.
Increase floating point epsilons on a few tests to pass on CCL.

Failure of the symmetric-cholesky-decomposition assertion occurs because
of 1 element in the decomposition. It did not fail on SBCL or LispWorks.
Needs to be investigated.