Support VIIRS cloud mask

This is step 1 in the larger task of A) supporting all intermediate products, and B) updating the Suomi NPP Product Profiles (product metadata).

The Suomi NPP file filter required mods because the creation time on geolocation used for intermediate products does not match what is specified in the reference global attribute.  Similar to how creation time for terrain-corrected geolocation will not match the creation time of the actual product.

The Suomi NPP data chooser required mods because variables like the cloud mask are stored as quality flags, which until now were being ignored.  More work is needed here since these are sometimes bitmasks, but for now the byte quality flags are usable.

The XML Product Profiles need updating, but for now I added the cloud mask profile since that is the product I tested these changes on and is the one needed most urgently.

Sample cloud mask visualization attached...

![VIIRS_Cloud_Mask](https://f.cloud.github.com/assets/2334847/98973/70540a62-673d-11e2-9bac-39575f564085.png)