Make define_blocks warning a note

[uramirez8707]

Describe the bug
Whenever you don't have even blocks, you will get this warning

"WARNING from PE     0: atmos_modeldefine_blocks: domain (  16  12) is not an even divisor with definition (   1   8) - blocks will not be uniform

Because this is warning, every PE outputs that warning, which causes the stdout to be very lengthy

To Reproduce
Use an uneven block size and you will get that warning

Expected behavior
This should be a NOTE, so that only the root pe outputs that warning

System Environment
This happens in any system

Additional context
N/A

[bensonr]

For cases like the one you mention, everyone prints the warning and it isn't ideal. But there may be cases where you do a non-even domain layout divisor and only certain mpi-ranks will be uneven. For example, a c48 with a layout of 4,5 will give you 8 total domains of (12x9) and 12 total domains (12x10). Using block size of 1,5 will only print warnings for those 8 (12x9) domains where the block sizes won't be equal.

Let's modify the logic and message to output "N out of M total domains have non-uniform blocks for layout (p,q) and blocksize (r,s)"