Improve memory footprint of JobOptionsSvc

after #155 (closed) we still use a lot of memory for the keys of the internal JobOptionsSvc dictionary and most of the strings are duplicated as we have things like:

Algorithm1.Porperty1
Algorithm1.Porperty2
Algorithm2.Porperty1
Algorithm2.Porperty2

The space used could be reduced using a trie or a DAWG instead of a plain map.

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