Feature #2262: Add new isisminer application to system
Add PvlFlatMap class that stores ISIS Pvl structures as a flat lookup table
There will be no impact on existing ISIS programs.
The PvlFlatMap class will provide a very fast convenient way to store PVL keywords for applications that require extensive use of them. It is intended to provide a much easier interface to ISIS Pvl structures that represents them as a single flat lookup table.