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

These symbos have been replaced by "elpa_get_communicators" and will
be deleted at some point

This commit does not change the interfaces defined in ELPA_2015.11.001 !
All functionality is available via the interface names and definitions
as in ELPA_2015.11.001

But some new interfaces have been added, in order to unfiy the
references from C and Fortran codes:

- The procedures to create the ELPA (row/column) communicators are now
  available from C _and_ Fortran with the name "get_elpa_communicators".
  The old Fortran name "get_elpa_row_col_comms" and the old C name
  "elpa_get_communicators" are from now on deprecated but still available

- The 1-stage solver routines are available from C _and_ Fortran via
  the names "solve_evp_real_1stage" and "solve_evp_complex_1stage".
  The old Fortran names "solve_evp_real" and "solve_evp_complex" are
  from now on deprecated but still functional.

All documentation (man pages, doxygen, and example test programs) have
been changed accordingly.

This commit implies a change in the API versioning number, but no
changes to codes calling ELPA (if they have been already updated to the
API of ELPA_2015.11.001)

For the library functions which are accessible by the user
man pages decribing the Fortran and C interface exist:

-get_elpa_row_comms
-solve_evp_real , solve_evp_complex
-solve_evp_real_2stage, solve_evp_complex_2stage

For the "service binary" print_available_elpa2_kernels,
also a man page exists.

TODO: extend man pages to test-binaries, or do not install test-binaries