Add a flag in CoverageView to declare bands are aligned

[aaime]

Right now CoverageView StructuredCoverage interfaces report outputs based on the granules found. For example, if there is one product made of 13 granules, you will get 13 as the count, not 1.
This is because the view is currently operating without really knowing if the granules are aligned or not, for the way it works, it's really just building N mosaics, zero filling the missing granules if any, and then band merging the results.
We should add a flag to tell the view bits are really aligned and should be considered a "unit" (at which point, we can run all structured info queries on the first band, ignoring the others... downside, there will not be anymore a way to locate all granules on disk via "location" like today)