Make CGNR iterative solver compatible with -no_reduced_fft in MPI mode

[GoogleCodeExporter]

I have accidentally found this bug while running automatic tests. It is present 
down to at least v.0.78 (the earliest Windows MPI executable that is available).

However, the combination of parameters is rather weird to seriously worry about.

Original issue reported on code.google.com by yurkin on 24 Sep 2013 at 4:25

• Blocked on: #177

[GoogleCodeExporter]

Issue 57 has been merged into this issue.

#57

Original comment by yurkin on 25 Sep 2013 at 6:54

[GoogleCodeExporter]

r1263 adds an explicit exception for this case. However, making such a weird 
combination operational requires significant effort - rearranging of memory 
distribution memory distribution should be changed to have both x and gridX-x 
on the same processor. This is of low priority.

r1263 - 3fd68c9

Original comment by yurkin on 25 Sep 2013 at 9:55

• Added labels: Priority-Low
• Removed labels: Milestone-1.3, Priority-Medium
• Now blocked on: #177

[myurkin]

I have changed this issue from bug to feature, changing the title accordingly, since it is now the missing functionality rather than failure.