PRACE NPT

Onesided communication seems not to be very stable yet:

-- To be sure that window addresses are long enough the

   parameters 'disp' and 'mlen' MUST be declared as

   Integer(8).

-- A peculiarity of SGI Altix/Origin systems is that

   the buffer 'message(mlen)' must be put in a Common Block

   otherwise 'MPI_Win_Create' will fail without setting all

   kinds of environment variables.

-- As there is no harm in placing 'message(mlen)' in common,

   we retain that for the general version:

   Common /buffer/ message(mlen)