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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"

We decided not to provide this information via the key/value store, but
rather to use the ftimings module for that.

@loh will take care to implement ftimings in the new API
@amarek wants to port the legacy API so that the old global module
  variables still contain valid values

-man pages have been updated
-man pages for legacy API are only installed if legacy API is enabled