[Scalapack] Missing function prototypes and outdated ifdefs in scalapack

[Glaesemann, Kurt R]

I suggest that for long-term code bug detection, you move all function
prototypes to a single *.h file now that BLACS,PBLAS, and ScaLapack are
merged.  Many *.c files have internal prototypes or call functions that
return "int" with no prototype at all.  Using a gcc based mpicc, and
-Wstrict-prototypes -Wold-style-definition  -Wmissing-prototypes
-Wmissing-declarations
Will find these.  I ran across these when asked to look into building a
version with Fortran integers of size 8 bytes.

Also, you may want to remove code for non-MPI platforms (there is still some
UsingMpiBlacs ifdefs) and old bad MPI's and C (ifdef for __STDC__
ZeroByteTypeBug MpiBuffGood etc.), since you got rid of the TRANSCOMM Stuff,
I doubt anything needs these now.