bugfix for the "automatic" topologyy generator:

It used to fall back to the old method, when some of the spcifications
for nprocs have already been set, because it should not overwrite
something e.g. specified by parameters. If this is not the case,
nprocs is usually initialized with 0es. This was good.

PUGH also tries to be smart and for very small extends in one direction
(smaller than 2*ghostsize) it presets nprocs in that direction with 1.
This is also good.

Now, PUGH presets this before the "automatic" topology generator kicks
in, which means this sees the "1" and falls back to the old method. This
old method however has problems with exactly this type of grid and gets
it wrong (overwriting that "1").

This patch now lets the automatic method only fall back to the old method
if it arrives at a different answer than preset values (if set). (This
fallback is neccessary because it cannot handle all cases which the old
method does.) This fixes the problem because the automatic method also
arrives at the preset value of "1" (and can set the other dimentions which
have not been preset).


git-svn-id: http://svn.cactuscode.org/arrangements/CactusPUGH/PUGH/trunk@497 b61c5cb5-eaca-4651-9a7a-d64986f99364

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