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The intention is that this release still provides the old interface
with only the new API functions as an addition. Thus, the libtool
'current' and 'age' fields are both incremented by 1.

For the RPM spec file this means that the 'so_version' macro still has
the value '8'

This is a bit cumbersome, as it involves yet another abstract
intermediate type, but necessary due to language limitations.

Setting a bandwdith of the input matrix via

elpa%set("bandwidth",bw)

tells ELPA 2stage, that matrix is already a banded matrix
with bandwidth bw. Then some compute steps can be skipped

By mistake a procedure has been named
"invert_tridiagonal" but the correct name should be
"invert_triangular"