Some of the file names were too long, automake then dropped these
files when doing "make distcheck"

Apparently with "-check all" some versions of the Intel compiler
complain about the use of

  C_SIZEOF(a(1,1,1))

and similar, when a is not already allocated.

Now this is done consistently both in autoconf and automake. One can now
safely call make clean and the header files are re-generated
automatically.

In my humble opinion it is much more obvious to specify

  --with-mpi=no

instead of

  --enable-shared-memory-only

to configure without MPI

This should make it easier to compile ELPA for Debian/Ubuntu, now it
should be sufficient to just

  ./configure

without a need to set LIBS or SCALAPACK_LDFLAGS