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There was again a case where stack-variables were loaded with
instructions that needed properly aligned memory. This only surfaced
with the Intel C compiler, where the stack layout evidently was
sufficiently different to trigger this.

This was also the case for SSE kernels

There was an error in the strip_width calculation leading to wrong
results for certain values of 'nev'. This is still not properly
investigated, should be checked again.

Exchange _mm512_load_pd()/_mm512_load_ps() of stack variables with
_mm512_set_pd, as the stack variables might not have proper alignment!

- Remove all use of ELPA internal modules, the test programs now
  only use the public ELPA API. This is now enforced, by hiding the
  private modules

- Prefix all test internal modules with "test_" to make it really
  clear that these modules are not to be used by users.