Issue 1114 - allow non 1:1 mlmasks.

[kwekmaster]

Allow non 1:1 mlmasks to be imported thru WKit

Fixed:

• removed code based on the incorrect assumption that all mlmasks are 1:1. It is not.
• since the original code assumes that it is 1:1, need to also change the logic to determine power-of-two ness of the dimensions

Tested:

• Maintained previous behavior for 1:1 mlmasks
• Works with non 1:1 mlmasks
• Enforcement of the power of two constraint

[rfuzzo]

Looks good