add ACOLITE products to Sentinel2 driver.

[ra-tolson]

plan of attack:

• [x] add products to the _products dict
• [x] look at indices block and see if the approach can be copied
• [x] draft method sentinel2Data.process_acolite to copy the stanza from landsatData
• [x] look over sentinel2 to see if any additional wiring is needed before starting acolite processing
• [x] call process_acolite from sentinel2Data.process
• [x] set bands; need band names and units, mostly for DH prep
• [x] test run(s)
• [ ] update system tests

[ra-tolson]

PR #397 fixes this.