GELATO: Extend filters

[Rene Ranzinger]

Modify the GELATO filters to allow additional filters with ranges (see attached file).

There are filters that will allow or disallow structures based on the presents of certain features/substructures (type=boolean) and filters that will allow or disallow structures based on how often a features is present (type=integer). GUI needs to be changed to support this cases. In addition a primitive combination logic (all filters AND or OR) is needed.